History of Streetcars in D.C.
Streetcars ran on the streets of D.C. from 1862 until 1962. During this time, they served as the backbone of D.C.’s transportation network until they were replaced by buses beginning in the late 1950′s.
A 1958 map of D.C.’s streetcar system is available on the website of the National Capital Trolley Museum: http://www.dctrolley.org/dctrolleymap.htm
A comprehensive history of streetcars in the District is available at: http://en.wikipedia.org/wiki/Streetcars_in_Washington,_D.C.