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| Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) (661178) | |
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| (663207) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by SelkirkTMO on Fri Aug 8 05:19:03 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by 5119 on Fri Aug 8 04:24:13 2008. ALL of the "pre-war" cars had pretty much "standard motors" and electricals and airs ... it was all about the "arrangement of the running gear" (Brake left or right) but otherwise, a STANDARD had endured for a BERY long time as far as motors, group switches, and brakes. An ARNINE was pretty much the SAME as a LoV, HiV, MP54, or Erie Lackamoney ... Me-23 and simpler were pretty much the standard for "railroad" from NY Central to IRT ... the OLDER "spur gear" stuff was pretty much common other than gear ratios for "expected maximum grade" and "tractive effort." And the motors were also largely similar.Betcha LoV's was what BOT emulated in the design of the arnines and such ... anything BMT was to be rejected, though I woulda REALLY gotten my yayas off running Bluebirds on the D train after Chrystie. :) |
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Re: What is the mechanical condition of the Low V? |
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Posted by SUBWAYSURF on Fri Aug 8 07:01:50 2008, in response to Re: What is the mechanical condition of the Low V?, posted by Tony Clifton on Thu Aug 7 18:13:43 2008. It's "FOAMERIFFIC!" reasoning. |
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| (663217) | |
Re: What is the mechanical condition of the Low V? |
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Posted by R33/R36 mainline on Fri Aug 8 07:48:02 2008, in response to Re: What is the mechanical condition of the Low V?, posted by Broadway Buffer on Fri Aug 8 01:23:36 2008. No, it was going N/B the 68 was going faster. R68's have a faster 0 to 15 than the R1/9's. |
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iPhone 6 (4.7 Inch) Premium PU Leather Wallet Case - Red w/ Floral Interior - by Notch-It |
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| (663254) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Dan Lawrence on Fri Aug 8 10:16:49 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 05:12:39 2008. You would have loved Baltimore's PCC cars. BTC got tired of replacing limit relays in the late 1940's. PCCs that are run a lot in switch would burn the contacts on the limit relay.BTC's solution was to take the switch notch out of the master controller. It's still there electrically, but you have to be able to find it. Standard practice is to depress the power pedal half way and release it when the car reaches the desired speed. |
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| (663271) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Gerry6309 on Fri Aug 8 10:50:23 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Dan Lawrence on Fri Aug 8 10:16:49 2008. Boston did the same by jumpering the 3 and 4 train line wires on their cars. Picture Window cars had no "Switch" at all. Was it the starting resistance cut out by the R2/C2 contactor or the limit relay that was failing? |
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| (663304) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Chris R16/R2730 on Fri Aug 8 12:17:58 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by 5119 on Fri Aug 8 04:16:24 2008. The Multis were great at acceleration, not so great at braking. |
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| (663387) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by 156n3rd on Fri Aug 8 14:41:55 2008, in response to R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 02:00:57 2008. Just reading all your comments on the Bluebirds and Multi's makes me pine for classic equipment like that. It shows just what an impact those machines had on the system. They must have been so well built that they left quite an impression for anyone who drove them and rode them. |
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| (663395) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Hank Eisenstein on Fri Aug 8 14:57:04 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by 156n3rd on Fri Aug 8 14:41:55 2008. Not so much that they were well-built, but that they were unique, and it cost them their lives. |
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| (663424) | |
Re: What is the mechanical condition of the Low V? |
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Posted by Gerry6309 on Fri Aug 8 16:43:50 2008, in response to Re: What is the mechanical condition of the Low V?, posted by Jeff H. on Fri Aug 8 02:23:47 2008. 0900s are Orange Line cars with PC-10 and Line Voltage control. The PTR is not necessary in the first car but may be needed in the following cars since all circuits are powered from the train line and therefore the PTR makes sure the car recycle when gapped. Of course the brakes release in the whole train when the first car gaps, could be scary |
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| (663453) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by irt1958 on Fri Aug 8 17:46:34 2008, in response to R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 02:00:57 2008. The 59th - 125th; 36th - Pacific Street and the Rockaway flats runs are great examples of that.The Arnines were lighting fast, after about a minute, on those long runs. |
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| (663463) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by randyo on Fri Aug 8 18:03:09 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 05:19:03 2008. NY Central prewar MUs lacked electro pneumatic brakes and used M-23 brake valves. As far as BMT designs being rejected, the R-1/9 design is strongly based on the BMT D type design and the pantograph gate design is definitely from the BMT steels. |
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| (663464) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by randyo on Fri Aug 8 18:04:54 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Chris R16/R2730 on Fri Aug 8 12:17:58 2008. From what the BMT old timers told me, the Multis were better at braking than the SMEEs when they were properly maintained. |
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| (663468) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by SelkirkTMO on Fri Aug 8 18:21:46 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by randyo on Fri Aug 8 18:03:09 2008. Howdy, guy! Yeah, the lack of electric brake was the reason why I said "ME23 and simpler" back there. But from an operating standpoint, if you could run one, you could pretty much run anything out there. Aside from the gate cars and other "swapped handles" cabs ... in a way, I'm GLAD the Q cars were gone by the time I landed. Had enough "mental effort" trying to remember to not lap a SMEE. And of course, centering up the reverser and let the controller pop while coasting was also right out. Heh. |
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| (663478) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by SelkirkTMO on Fri Aug 8 18:34:33 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by irt1958 on Fri Aug 8 17:46:34 2008. To this day, STILL my favorite cars. :) |
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Re: What is the mechanical condition of the Low V? |
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Posted by Broadway Buffer on Fri Aug 8 19:15:26 2008, in response to Re: What is the mechanical condition of the Low V?, posted by R33/R36 mainline on Fri Aug 8 07:48:02 2008. Heh. So the R-68 D was apparently faster upon take-off. Glad to see it was confirmed by people who actually know the equipment, though. |
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| (663668) | |
Re: What is the mechanical condition of the Low V? |
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Posted by Jeff H. on Sat Aug 9 01:53:39 2008, in response to Re: What is the mechanical condition of the Low V?, posted by Gerry6309 on Fri Aug 8 16:43:50 2008. If the control circuit is powered only by the local trolleyvoltage in the lead car and there are no bus jumpers, then the whole train would drop out when the lead car goes over a gap, no? The IRT HI-Vs had a big bus jumper heavy enough for motor current. It was protected by a current limiting resistor. Control power was thus always available. |
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| (663754) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Steve B-8AVEXP on Sat Aug 9 09:35:49 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by randyo on Fri Aug 8 18:03:09 2008. Plus the R-1/9s had the exact same braking system as the Triplexes right down to the "tch-ssss" magnet valve sound. |
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| (663755) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Steve B-8AVEXP on Sat Aug 9 09:37:22 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by randyo on Fri Aug 8 18:04:54 2008. One can only imagine how the multis took those curves on the Larry. I understand they even had "Hold on!" signs inside. |
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| (663756) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Steve B-8AVEXP on Sat Aug 9 09:39:02 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by 156n3rd on Fri Aug 8 14:41:55 2008. The Triplxes were about as well-built as any piece of subway equipment. They received little if any maintenance yet were still running like tops when they were prematurely yanked. |
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| (663757) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Steve B-8AVEXP on Sat Aug 9 09:39:35 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 18:34:33 2008. We know, Kev. I love 'em too.:) |
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| (663972) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 20:15:16 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Dan Lawrence on Fri Aug 8 10:16:49 2008. What exactly did "switch" do? Was it an automatic speed control of sorts? |
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| (663978) | |
Re: What is the mechanical condition of the Low V? |
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Posted by JournalSquare-K-Car on Sat Aug 9 20:32:17 2008, in response to Re: What is the mechanical condition of the Low V?, posted by Jeff H. on Fri Aug 8 02:51:08 2008. Thanks for this info, but i have some questions...How could the arc have have the full force of 600 volts behind it? wouldn't the other 4 lower the voltage?Also, what type of lights do trckworkers use? They seem to be incandescent. Also, i guess since the arc is not self commuting is the bigger explanation...but i thought lighbulbs had a fuse built into them which poppped when they burnt out. I guess the bulb, in essence, becomes a sort of cathode ray tube, with the supports playing the anode, and cathode. Then once the gas IS ionized, it has to flow in one direction, and it keeps going and going. Also, does this ALWAYS occur with regular hous lights used in railcars? Or does it happen sometimes? |
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Re: What is the mechanical condition of the Low V? |
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Posted by FLASH GORDON on Sat Aug 9 20:41:55 2008, in response to Re: What is the mechanical condition of the Low V?, posted by JournalSquare-K-Car on Thu Aug 7 18:44:47 2008. IRT cars have the same motors and trucks as the IND BMT cars andthe trucks can be used on both. When I was there we went from 100 hp motors to 115 hp motors so it helped to make them faster. I think the 62's also have the same trucks. We are talking about R-10 to R -62 and nothing after that. FLASH GORDON |
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| (663988) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 20:45:43 2008, in response to R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 02:00:57 2008. You brought up that 3.5....heck, NOT EVEN LRVs accelerate that fast. Yet PCCs from almost 70 years ago did BETTER. BUT, like i have said before, an arnine did 1.75 with one truck...if it had two trucks powered, then it could easily have 3.5 MPH/s acceleration. From what i read though, SMEEs have about the same amount of horsepower as R9 cars, but since the SMEEs distribute it over all the wheels, they can take more advantage of it....plus dynamic brakes on all wheels...not like the IRT NTTs which don't have dynamic brakes on all trucks.Though that must have been a design consideration for SMEEs. They had all powered trucks, so all trucks had dynamic braks...more motors to maintain, but maybe the make it up in the savings of brake shoes? But what effect do dynamics have on resistor grids? Maybe they tend to butn them out faster? I wonder if dynamic brakes are even practical...regenerative..YES, but just for stopping poer, maybe EDDY brakes are better, they release the heat through the wheels like regular brakes do. Some Multis had Eddy brakes...and they don't mess up resistor grids i bet, and since Eddy brakes are simpler(i think) than dynamic brakes..less electronics, like relays, to take care of, and you could have them on unpowered trucks...just some thoughts. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by BMTLines on Sat Aug 9 20:54:43 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Chris R16/R2730 on Fri Aug 8 12:17:58 2008. If the Multis had such issues with braking (and yes I have heard the anecdotes) does anyone know if there were any accidents as a result of a brake failure? |
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Re: What is the mechanical condition of the Low V? |
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Posted by JournalSquare-K-Car on Sat Aug 9 21:22:37 2008, in response to Re: What is the mechanical condition of the Low V?, posted by FLASH GORDON on Sat Aug 9 20:41:55 2008. I was pretty sure they had SIMILAR trucks, but i could have sworn some of the 75 footer cars seem to have different trucks, especially the R44s and R46s. All other cars seem to have the same trucks.Also, thanks for that info about swapping 100HP motors for 115 horse motors...but my question is WHY NOT REACTIVATE full field shunting? Or was this before the SMEE cars were neutered? Also, i read here that some trucks that are running on the tracks could be 50-60 years old..is this true? That would be an amazing feat, NYCTA track is rough track, in my opinion, and to survive 50 years of that pounding is something to be proud of. |
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| (664019) | |
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 21:25:50 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by BMTLines on Sat Aug 9 20:54:43 2008. You bring up an interesting thing...were there ANY wrecks like union square, or wilyB during the old times, like when the irt wasn't even fully signalled? Excluding Malbone, which was caused by negligence on MANY levels.I think the old railroads were rather safe, and i didn't see anything on NYCsubway.org that would imply a failure worth noting. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by R30A on Sat Aug 9 21:27:13 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 21:25:50 2008. Yes, there were MANY such wrecks. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 21:36:25 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by R30A on Sat Aug 9 21:27:13 2008. Do you have any proof? I am talking about the IRT and BMT....other than Malbone, i think there were no fatalities except for some bombings...BY GERMANS. Bad guys didn't alwaywear turbins, it is just easier to have prejudices against those who look or dress differently. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by R30A on Sat Aug 9 21:44:15 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 21:36:25 2008. 42nd street wreck on the IRT, 71st street wreck on the IND, 53rd street wreck on the Manhattan Els, just to name a few. All were pretty bad wrecks, and by no means are these the only bad ones. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 21:45:52 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by R30A on Sat Aug 9 21:44:15 2008. Where can i find more info on those wrecks? |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by R30A on Sat Aug 9 21:47:24 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 21:45:52 2008. Books, newspapers from the time, and I am sure at least some of them have some info on NYCsubway.org |
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Re: What is the mechanical condition of the Low V? |
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Posted by FLASH GORDON on Sat Aug 9 21:54:12 2008, in response to Re: What is the mechanical condition of the Low V?, posted by JournalSquare-K-Car on Sat Aug 9 21:22:37 2008. The trucks from R-10's are the same as the R-36's.Not sure but smee trucks went under R-44's when the Rockwell trucks failed till new ones could be built. I don't deal with the field shunt stuff Jeff is up on that. Every truck has a number on it and they have books which will tell you When each was built and what cars it was under. FLASH GORDON |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 21:55:58 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by R30A on Sat Aug 9 21:47:24 2008. i found this site It probably doesn't have all the wrecks. I know it doesn't have the wreck which eventually turned an arnine into an arten wannabe.And also, that wreck with the triplexes, i wonder if anyone died. I hope, and bet nobody did, because those Triplexes were tough cars, from what i read. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Dan Lawrence on Sat Aug 9 22:54:44 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 20:15:16 2008. Switch is one point of power only, car does not accelerate. Series hooks the motors in series, each motor gets 300 volts. Each point removes resistance until none is present, Parallel connects 600 volts to each motor and inserts full resistance again, each point removes resistance until Full Parallel is reached.Motor control can be manual, as on a streetcar or or automatic like a subway or elevated train. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sat Aug 9 22:57:46 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Dan Lawrence on Sat Aug 9 22:54:44 2008. Oh, thanks, so "switch" would hold the power at a certain level? Isn't it bad to run power through the resistors for too long though? |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Dave on Sat Aug 9 23:20:03 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 21:45:52 2008. Why didn't you ask that question before you spouted off about how there weren't any wrecks? SHAME. |
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Re: What is the mechanical condition of the Low V? |
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Posted by Hank Eisenstein on Sun Aug 10 00:57:01 2008, in response to Re: What is the mechanical condition of the Low V?, posted by FLASH GORDON on Sat Aug 9 21:54:12 2008. My (anecdotal) understanding is that many of the rebuilt cars got trucks from cars that were retired, and the 'rotating pool' of spare trucks for all the pre-R142 cars is the same, and some trucks in the pool may still be left over from retired R10s. As long as the truck passes inspection (no cracks), it stays around. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Hank Eisenstein on Sun Aug 10 01:00:18 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 20:45:43 2008. WTF are you babbling about? Regenerative braking IS dynamic braking, but instead of dissipating the energy produced as heat, the energy is redirected to more useful purposes. And dissipating heat through the wheels is BAD. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Hank Eisenstein on Sun Aug 10 01:09:37 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 21:55:58 2008. At 20 mph, you're going to get hurt by the sudden stop no matter how well the vehicle you are traveling in is built, unless you are properly restrained. At 30-50, you're more likely to recieve a 'permenantly disabling' injury. Above 50, the likelyhood of a permanently disabling injury is twice that as 30-50, and the chance of death is about 15%, IIRC. Above 80, the likelyhood of a permenantly disabling injury is near 99%, and the likelyhood of such an injury resulting in death is about 40%.Damn NHTSA statistics...can't find the paperwork when you need it. And for some reason, nhtsa.dot.gov is not available :( I hate not being able to check my facts. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by BAISLEYPARKRUSS on Sun Aug 10 05:50:56 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by BMTLines on Sat Aug 9 20:54:43 2008. 7016 A-1 went into the bumper block at Metropolitan Av. It returned a few weeks later repainted. Upon investigation it was part of another consist renumbered . Too young to remember cause |
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Re: What is the mechanical condition of the Low V? |
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Posted by irt1958 on Sun Aug 10 06:03:59 2008, in response to Re: What is the mechanical condition of the Low V?, posted by JournalSquare-K-Car on Sat Aug 9 20:32:17 2008. In reference to your first question- Imagine 5 resistors, all of the same value, in one series loop, across a voltage source. Every resistor would an equal voltage drop; with the sum of these drops equal to the source. Any break, in that circuit, would have a voltage that would measure about equal to the source, at the break terminals.The highest drop, of course, would be across a higher (infinite) resistance, ie Argon, a vacuum etc. in a light bulb. |
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Re: What is the mechanical condition of the Low V? |
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Posted by FLASH GORDON on Sun Aug 10 08:57:28 2008, in response to Re: What is the mechanical condition of the Low V?, posted by Hank Eisenstein on Sun Aug 10 00:57:01 2008. With all the cars now going to Davy Jones there must be a lot ofspare trucks at 207th. The new type trucks have an over seas look to them and so far seem to be doing OK. FLASH GORDON |
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Re: What is the mechanical condition of the Low V? |
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Posted by JournalSquare-K-Car on Sun Aug 10 10:30:54 2008, in response to Re: What is the mechanical condition of the Low V?, posted by irt1958 on Sun Aug 10 06:03:59 2008. Oh, so then the other lightbulbs would turn off while the arc is jumping over...but i thought the arc would be like a closed circuit(low resistance). Thanks for the info though.I get what you are saying though. Now that i am thinking of it...would it almost be like a pulsation or something? Say the arc is a closed circuit(low resistance)..it will light up the other bulbs, and when the other bulbs light up, they will drop the voltage, so then there won't be enough potential to jump the gap in the bulb, and the arc turns off momentarily, lights turn off...600 volts across the points in the lightbulb, then the cycle repeats. Is this a good way of looking at it? I wonder if such systems were used for chopper controls before solid state electronics came about. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sun Aug 10 10:35:37 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 05:12:39 2008. Interesting...you used to go ride the Newark City subway with the excellent PCCs? One thing i am interested in is HOW YOU GOT THERE. I bet you took the PATH train, right? Did you ever ride the "red Mcadoo", or Black cars? And what about the K cars? Anything you noticed about them? Any nice sounds? Smooth ride? From what i read, the H&M cars were similar to IRT cars except that the H&M cars were a lot smoother.One of those Beautiful PCCs are still at grove street yard, and they look nice, even in the NJT paint, which doesn't look bad o them. The current kinko Sharyos are uglier, and are actually slower too. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by JournalSquare-K-Car on Sun Aug 10 10:41:08 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Hank Eisenstein on Sun Aug 10 01:00:18 2008. Really? What about when freight trains brake? You realize that freight cars don't have DYNAMO brakes? Also, some current IRT cars have straight air brakes on trailer trucks.And i know that regenerative braking is dynamic braking...but a more complex circuit is needed to detect a load at the third rail. There is nothing bad about dissipating heat through wheels, for many years, that is the only way it was done. And if anything, you can have discs mounted on the axle too, so you an dissipate heat through them as well. The good thing about eddy brakes is that there are no brake pads to wear out, just make sure you se a heavy enough wire with a good enough insulation. |
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Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
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Posted by Dan Lawrence on Sun Aug 10 11:49:09 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by JournalSquare-K-Car on Sat Aug 9 22:57:46 2008. Yup.Switch is one point of power only. If you run constantly in switch you can overheat the resistors. Good motormen are trained not to run in switch, but notch up to full series if possible (traffic or automobiles ahead) and shut off and drift until safe to take power again. |
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Why isn't Alternating Currentu used to power Subways? (was R1/9 acceleration) |
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Posted by JournalSquare-K-Car on Sun Aug 10 12:06:09 2008, in response to Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by Dan Lawrence on Sun Aug 10 11:49:09 2008. I see now, thanks. I bet that DC chopper control would allow you to run in low power for a while...unless the equiptment would overheat as well. However, i think the transformer system, like on GG-1s would allow you to run at low power for longer times because no resistors are involved, and transformers are more effective at dropping voltage without wasting energy as heat..So now i have questions... Why don't they use AC voltage to power subways? It is easier, and more efficient to control. SAy they use 600 volt AC. The peak voltage might have to be 750 or something, since you have to get the root mean square of the sine wave to get the average line voltage. And anyways, i don't think 750 volts is too high, PATCO uses it. Moscow metro uses 850 volts, i think, so why not use AC to power subways? |
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Re: What is the mechanical condition of the Low V? |
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Posted by irt1958 on Sun Aug 10 12:18:23 2008, in response to Re: What is the mechanical condition of the Low V?, posted by JournalSquare-K-Car on Sun Aug 10 10:30:54 2008. No, I don't think so, go back to my last sentence and take a look at this:http://www.youtube.com/watch?v=sngLL29LH14 an arc is an open, NOT closed circuit, so the rest of that wouldn't make sense. |
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Re: Why isn't Alternating Currentu used to power Subways? (was R1/9 acceleration) |
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Posted by Chris R16/R2730 on Sun Aug 10 12:30:39 2008, in response to Why isn't Alternating Currentu used to power Subways? (was R1/9 acceleration), posted by JournalSquare-K-Car on Sun Aug 10 12:06:09 2008. Got billions to re-configure the system and replace all the DC-powered cars? |
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