Anyone ever think of making a double decker subway?

Can't think of a better community to ask.

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I dunno where you live but Metra in Chicagoland (connecting the city center to the surrounding suburbs) are double decker already. The L trains downtown don't really need them.
- Metra is more of a commuter system than a metro system... but when looking at systems like San Francisco's BART, the line between a metro and a commuter railway gets blurry.

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