That's true! Their problems stem from the city's antiquated branching system, lack of station investment, and need for a giant N-S tunnel to allow through-running. At least it mostly separates commuter and urban rail.
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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