Probably not because subway lines run from point-to-point and reverse direction at each point.  Only switches needed are where lines join and separate (if desired) and where you want to cross trains from one track to the other.  Some switches also needed where trains enter storage yard and/or maintenance locations.  Same goes for elevated lines; not very complicated.

Most modelers choose to run loops (subway or elevated) either under city or through city, if elevated.

Chuck

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