A common design choice which irritates me in metro systems is to have all lines use the same color scheme (or very close to it) on rolling stock--the Tube obv with its red/white/blue, or the very common "silver (mayb w black or brown accents) everything" in USA
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Its easier to do when your rolling stock by definition cannot be mixed and has different yards. The flexibility of a non-line specific rolling stock is really important and shared depots cut down on cost (not that I don't enjoy colorful vehicles as well)
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Boston has 4 distinct and incompatible lines. None of the trains can be used on Another line. DC has one train design, as does Chicago.
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Hence my point that Boston has rolling stock that cant be mixed...
End of conversation
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