Subway systems at the same scale

Neil Freeman, 2004–
maps
format and dimensions vary

kilometer 1 km
mile 1 mi

see at double this scale

These are not all of the world's subway systems. You might be interested in the difference between subways and commuter rail.

Thanks to alan_cunningham for Atlanta, to jonathan.addleman for a Montreal map, to Kevin Keller and Michael Kitzman for links a LA map, to jamison for an SF MUNI map, and to ssp for Berlin S-bahn help. Further thanks to Greg Smith, clgonsal, Damien Fox & Matthew Corks for help with Toronto, and to Vincent Graux for a Brussels map. Many thanks to A. Feldman & A. Lorentzen for loans of Philadelphia & Budapest maps, respectively. Radical Cartography has a similar page.