As with many large cities, a large number of Boston-area streetcar lines once existed. However, only a few remain, namely the four branches of the Green Line and the Ashmont-Mattapan High Speed Line, with only one (the Green Line "E" Branch) running regular service on an undivided street. This is a table of when each streetcar line was converted to trackless trolley or bus. Only information post-1940 is complete.