2018 update: added Phoenix, Miami, London, Copenhagen, & Airport People Movers.
Canada:
Vancouver Skytrain
Montreal Metro
Edmonton LRT
Calgary C-Train
USA:
New York City Subway
Washington DC Metro
New Orleans Streetcars
Las Vegas Monorail
San Francisco Cable Car System
Phoenix - Valley Metro Rail
Miami Metromover
Norway:
Oslo Metro & Tramway
Germany:
Hamburg - U-Bahn & S-Bahn
Frankfurt - U-Bahn
Cologne - Rhine-Ruhr S-Bahn
Austria:
Vienna - U-Bahn
Netherlands:
Amsterdam Metro
Belgium:
Brussels Metro
France:
Paris Metro
UK:
London Underground
Denmark:
Copenhagen Metro
Airport People Movers:
YYZ (Toronto) - LINK
LAS
PHX - Sky Train
MIA - MIA Mover
SEA
CDG - CDGVAL
LHR