Ex-Brussels streetcar (tram) 7037 in San Francisco, renumbered 737 and painted in a historic livery of Zürich, Switzerland, which became one of San Francisco's sister cities in 2003. (This type of streetcar never operated in Zürich.)  Car 737 was built in 1952 by La Brugeoise, of Belgium, for Brussels and was acquired by San Francisco Muni in 2004, and was repainted and renumbered in 2005.  It is a PCC-type streetcar, but of a European type, with a body style different from that used for PCC cars in the U.S. during the era when new PCCs were being built.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/12786044@N00">David McSpadden</a> from Daly City, United States
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/familyclan/13047692123/">Historic trolley cars</a>