New York's isn't great, mindhttps://mobile.nytimes.com/2018/02/12/nyregion/water-nyc-subway.html …
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This is a good general rule that's far more broadly applicable than trains. You have the same issues with the government's legacy IT systems, as well as its water infrastructure.
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Fair. Though platform edge doors, as we see on new subway platforms, mean you can't have very different door layouts for different trains on the same line.
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not necessarily--just means that you'd need to indicate which doors will open for which trains, easy enough with color coding (this is common in Japan, not for platform doors, but for door position indicators which are painted onto platform edges)
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hypothetical example = there's one color door indicator which marks where doors on a 10-car train w 4 doors per car will be, another color for 10-car 6 door trains, another color for 6-car 3 door trains, etc etc
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Would be a lot harder to do that for platform edge doors, though. Especially if the differences are drastic (e.g. if different trains have different car lengths).
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harder with doors than with simple stripes painted onto the platform, yes--but could work, it all depends on the actual measurements and differences in question. certainly easier with things like common car length!
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But then there are often good reasons for differences (e.g. particularly sharp curves on one line). Tricky.
End of conversation
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My memory of the Boston T is that the trains were infrequent and overcrowded and the stations looked old and not in a good way.