Talk:Metrorail rolling stock (Washington, D.C.)

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[edit] Original vs. rehabbed

For the Rohrs, and the 2000 and 3000 Bredas, we need to separate out the facts/figures for these cars as originally delivered, vs. how they exist rehabilitated. I'll play with it some more when I get home, but I just thought I'd throw that one out there. I plan on doing some more reworking on the article when I get home as well. SchuminWeb (Talk) 00:02, 9 April 2006 (UTC)

[edit] Rearrangement

I rearranged the article a little bit - what do you think? SchuminWeb (Talk) 09:16, 9 April 2006 (UTC)

[edit] Stopping sounds

I think it would be great to add some detail on what makes the particular braking sounds. It seems to be a hot topic on YouTube to speculate what makes the noise: http://www.youtube.com/watch?v=is5vzJPBksQ ("electrical reversal in which the motors are braking speed to stop the train"), http://www.youtube.com/watch?v=G6dc5JdMgd0 ("the sounds come from devices called GTO thyristors, which feed pulses (the gear changing sounds) of current to the traction motors") Bajenkins (talk) 04:00, 13 January 2008 (UTC)

Well, the 3000 and 4000-Series Bredas get their distinctive buzz from an electronic "chopper", but as for the others, I couldn't tell you right offhand. Either way, though, I would think that descriptions of these sounds would be better placed in a different article than this one, perhaps one on AC motors? SchuminWeb (Talk) 05:37, 13 January 2008 (UTC)

Some people think the motors are essentially being put into reverse to stop the train, some think they are being used in regenerative braking, and some think it's just normal motor noise. I don't see the harm in adding two or three sentences to the effect of 1) the buzzing is made by chopper-controlled DC motors in the unrehabbed 3k/4k series, and the whirring/whistling is caused by xxx in the AC motors. and 2) it's motor-reversal/regenerative/whatever braking. Moreover, I think it would be better to put the information in this article than as an aside in a AC/DC motor article. Bajenkins (talk) 22:02, 13 January 2008 (UTC)

YouTube speculation is not a reliable source for inclusion in Wikipedia articles. If the mechanics behind Metrorail breaking sounds are documented by reliable sources, I'd favor their use in cited references with a related article. —Adavidb 01:06, 14 January 2008 (UTC)

I'm certainly not suggesting YouTube speculation is a reliable source of information. It's just that I noticed the widely varying theories and came to Wikipedia looking for the correct answer. I was kind of amazed that it was not mentioned anywhere. Bajenkins (talk) 17:28, 14 January 2008 (UTC)