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[happyslug]

3. Left doors are common on LRVs, and even some old PCC Streetcars had them,

http://en.wikipedia.org/wiki/PCC_streetcar


http://www.nycsubway.org/perl/show?13772



http://www.nycsubway.org/wiki/The_PCC_Car_-_Not_So_Standard

While the above PCC Streetcars had doors on their left side for these were "Double ended" Streetcars, i.e. you could operate them from either end. Thus the "Left Door" became the "Right Door" whenever the operator went from one end to the other end to operate the Streetcar.

On the other hand, Boston and some other cities did have left doors on single ended streetcars for center stop:

http://www.heritagetrolley.org/existBoston.htm

Modern LRV tend to have such left hand doors also, in addition to door that "switch" sides whenever the operator goes from one end to the other end of the LRV to operate it:


http://en.wikipedia.org/wiki/File:BoeingUSSRLV.jpg
http://en.wikipedia.org/wiki/US_Standard_Light_Rail_Vehicle