State government regulators that are different than municipal regulators are a REALLY IMPORTANT part of American federalism, and places without that oversight have problems.
Beg to differ--or at least to say that the difference in seat/standing ratio and door count ought to be much less pronounced that people in the Anglosphere think
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At a bare minimum: differences in seat arrangement, standing room, and door count do not require any differences in carriage dimensions, loading gauge, power source, etc--ought to be interoperable with subways even if slightly different inside
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Unless you have platform edge doors, when different door layouts do cause problems. Or a legacy system with a very tight loading gauge, small carriages, live rails, rubber tyres etc (as with both Paris and London).
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MBTA *is* a legacy system which is why interoperation is impractical without some sort of drastic systemwide overhaul--not something likely to happen in the near future. When I'm talking about interoperation and subway/regional differences, I'm talking about ideal, not legacy
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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.
End of conversation
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Are the other subways in the US much better though in terms of safety or maintenance?