Fuck Cars
A place to discuss problems of car centric infrastructure or how it hurts us all. Let's explore the bad world of Cars!
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The main downside of double-decker train cars is the time it takes passengers to to board them. And, since this is one of the main factors limiting metro frequencies and thus capacity, they're not that suitable for subways. To maximize metro capacity, you want long trains with many doors and very high frequency.
Double-decker cars are much more suitable for lower-frequency service (S-Bahn, regional, long-distance,...) where they're also commonly used.
Of course, you could still use double-decker cars in a metro (and maybe some places do), it's just suboptimal.
Two level platform? Then you're actually boarding double the number of passengers, could be useful in very busy stations.
It sounds like a weird idea at first, but maybe it could actually work. Kind-of like running two trains on top of each other instead of after each other. I guess the downside would be the need for bespoke rolling stock and larger platforms. I think, it would generally be preferable to double the frequency or run longer trains. But it could be interesting if you've already exhausted those.