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| (904101) | |
Re: What is the fastest speed of a subway train? |
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Posted by R42 4787 on Tue Feb 23 18:52:25 2010, in response to Re: What is the fastest speed of a subway train?, posted by Hank Eisenstein on Tue Feb 23 10:59:54 2010. Baltimore Metro is a system. It never got bigger than one route. |
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| (904165) | |
Re: What is the fastest speed of a subway train? |
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Posted by AEM-7AC #901 on Tue Feb 23 19:58:00 2010, in response to Re: What is the fastest speed of a subway train?, posted by Easy on Tue Feb 23 15:19:34 2010. And I wonder if Atlanta had built their system 20 years later would they have opted for a primarily light rail system?MARTA lucked out given that there was very little competition for FTA dollars, which allowed them to get rather high matches from the Feds for its construction. Given what we know now, MARTA would have definitely been built as a light rail system, but I'll be hesitant from speculating on the nature of what would have been built. Whether it would have developed as a ramped up streetcar (Phoenix) or a pre-Metro with an underground downtown tunnel (Seattle) remains to be seen. Heavy rail seems like the better long term investment. I'm biased as a Stadtbahn-lover, so I'll get that out of the way first. A lot of light rail systems are built as half-baked compromises to meet varying political and financial concerns, so corners are cut in terms of construction, and you end up things that may end up eating away at ridership. The main advantage that a heavy rail system has is that the unobstructed right of way allows for higher maximum and average speeds and more direct routings, but there's nothing preventing a light rail system from taking advantage of such methods to improve the speed and reliability of the service. The problem is that nobody is willing to pay for such methods financially or politically, and there needs to be some degree of transit oriented development and economic growth to create demand for ridership. A heavy rail system connected to a bunch of office parks with at grade crossings and street running ROW with no priority will suffer from the same problem as a light rail system, while a light rail system constructed to achieve high average speeds with the most direct alignments possible can achieve near heavy rail levels of service. |
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| (904508) | |
Re: What is the fastest speed of a subway train? |
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Posted by tunnelrat on Wed Feb 24 11:28:32 2010, in response to Re: What is the fastest speed of a subway train?, posted by Mitch45 on Tue Feb 23 15:05:30 2010. No legend,fact.it hit 87.7mph&the reason the motors burnt out was that half of them were cutout to simulate a full load of geese. |
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| (904751) | |
Re: What is the fastest speed of a subway train? |
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Posted by Easy on Wed Feb 24 21:24:02 2010, in response to Re: What is the fastest speed of a subway train?, posted by AEM-7AC #901 on Tue Feb 23 19:58:00 2010. I can agree with all of that, but I'd add that light rail ridership is also limited by the street running parts. For example in LA the blue line (which is already close to capacity at rush hour) will never run more than 12 tph or trains longer than 3 cars long. Still if I had to choose whether I would want two parallel light rail lines a mile or two apart or one heavy rail line, I'd choose the two lines.And BTW I think that the average speed on LA's light rail lines may be faster than the NYC subway and only slightly slower than the LA subway. Though some parts of the light rail system are very slow. |
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| (904761) | |
Re: What is the fastest speed of a subway train? |
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Posted by trainsarefun on Wed Feb 24 21:44:32 2010, in response to Re: What is the fastest speed of a subway train?, posted by LuchAAA on Mon Feb 22 21:30:59 2010. Mostly on account of the switches. Northbound timer through there is set to clear at 20 mph, and although it can be cleared a bit faster than that, hitting those switches much in excess of 25 mph is probably not a very good idea.A really, really slow move is the crossover there, especially northbound. 10 mph through the crossover then working against the grade to pull into Vernon-Jackson Avs. |
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| (904803) | |
Re: What is the fastest speed of a subway train? |
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Posted by AEM-7AC #901 on Thu Feb 25 03:46:43 2010, in response to Re: What is the fastest speed of a subway train?, posted by Easy on Wed Feb 24 21:24:02 2010. but I'd add that light rail ridership is also limited by the street running partsAt that point, you'd consider alternate routing to distribute railway traffic, blocking off smaller or less important side streets, and the ultimate step which was taken by the European systems, tunnels. In the case of the Blue Line, a branch may solve some problems, but ultimately, I suspect a tunnel under Long Beach Boulevard would be best. I think that the average speed on LA's light rail lines may be faster than the NYC subway Higher acceleration, 55 mph MAS*, and station spacing at averaging near a mile between downtown and Long Beach is probably why. If you discount the street running sections, I'd imagine that you'd boost average speeds considerably. In contrast, NYCTA is built around stations at near half mile intervals... *IIRC, per Siemens, the P2000 units are good for 70 mph... |
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| (904885) | |
Re: What is the fastest speed of a subway train? |
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Posted by Easy on Thu Feb 25 10:47:56 2010, in response to Re: What is the fastest speed of a subway train?, posted by AEM-7AC #901 on Thu Feb 25 03:46:43 2010. A tunnel under Long Beach probably won't happen, but you did nail the slowest point of the line. I think that the best case would be for them to figure a way to better coordinate the signals like they do on Flower and Washington. When you leave 7th/metro there is a countdown timer and if they leave when the light is white (or is it green?) they usally get lights synchronized for the next several miles until they hit the ROW. It doesn't work as well at rush hour when there are multiple trains on that portion, but it's still better than Long Beach where trains stop at the majority of the traffic lights.And the tunnels are interesting because some cities/neighborhoods prefer that the trains run at grade. For example the new Expo Line will run at grade through Santa Monica which is what Santa Monica wanted. I guess that there is s sense that the trains are more part of the commnuity that way and people will be more likely to take the train if they can see it. Also people will perhaps shop more often at businesses along the way. Of course the downside is that the trip takes a few minutes longer. |
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