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| Re: Question about the Queens Blvd CBTC. (1532064) | |
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| (1532220) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Train Dude on Tue Dec 10 16:33:53 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Stephen Bauman on Tue Dec 10 14:26:01 2019. Full service max brake is 3.0 mph/sec but emergency brake is 2.5 mph/sec IIRC |
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| (1532225) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Joe V on Tue Dec 10 17:45:10 2019, in response to Re: Question about the Queens Blvd CBTC., posted by TransitChuckG on Tue Dec 10 07:25:29 2019. I took the 1st semester of 4 credit calculus albeit with a terrible professor who couldn't explain his way out of a paper bag. Half the class had dropped during the semester. Got a C.Then I breezed through the 2nd semester of 3 credit integral calc for Business/Bio majors and got an easy B+. It is theories and proofs and such I could never grasp, just raw equations I could do easily. |
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| (1532226) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Stephen Bauman on Tue Dec 10 17:45:31 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Train Dude on Tue Dec 10 16:33:53 2019. Full service max brake is 3.0 mph/sec but emergency brake is 2.5 mph/sec IIRCYou didn't 2.5 mph/sec is the acceleration. The datasheet shows 3.2 mph/sec for the emergency braking rate. However, I've also seen 3.0. They've also had trouble achieving it. |
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| (1532227) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by randyo on Tue Dec 10 17:56:10 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Stephen Bauman on Tue Dec 10 17:45:31 2019. AFAIK, the brake system is not RT-5 which was original on the R-44s but is RT-7. |
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| (1532233) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Steamdriven on Tue Dec 10 19:23:45 2019, in response to Re: Question about the Queens Blvd CBTC., posted by VictorM on Mon Dec 9 19:35:24 2019. "would you really want the standing passengers thrown about like ten pins in a bowling alley?"Whadda they want for a lousy $2.75? To stand up forever? |
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| (1532243) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Train Dude on Tue Dec 10 20:36:49 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Stephen Bauman on Tue Dec 10 17:45:31 2019. Interesting, I have a book of data sheets up to R110. I'd not seen the one for the R160s. |
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| (1532291) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Steamdriven on Wed Dec 11 21:33:36 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Stephen Bauman on Tue Dec 10 17:45:31 2019. 3.0 mph/sec is garbage. Wheel brakes can do much better than that, and anti-lock for trains was invented ages ago. I believe Boeing LRVs had it. |
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| (1532292) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Stephen Bauman on Wed Dec 11 22:45:05 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Steamdriven on Wed Dec 11 21:33:36 2019. Wheel brakes can do much better than that,Quite possibly. However, NYCT's brakes don't. For one thing they use tread brakes instead of disk brakes. The NTSB tests following the Williamsburg Bridge crash showed they were operating at about 1.8 mph/sec. |
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| (1532305) | |
Re: Question about the Queens Blvd CBTC. |
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Posted by Train Dude on Thu Dec 12 08:34:00 2019, in response to Re: Question about the Queens Blvd CBTC., posted by Stephen Bauman on Wed Dec 11 22:45:05 2019. The train involved in the Williamsburg Bridge crash was an R42 which had clasp brakes with composite brake shoes. |
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