Passengers boarding a subway in Madrid

Description:

This course discusses urban transportation issues, such as the importance of passenger waiting time. (Image by caravinagre on Flickr.)

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Passengers boarding a subway in Madrid
Alt text:
Passengers boarding a subway in Madrid.
Caption:
This course discusses urban transportation issues, such as the importance of passenger waiting time. (Image by caravinagre on Flickr.)
Passengers boarding a subway in Madrid.