Just saw a neat American Experience documentary on public tv about the building of the Boston subway. How the 7 horse trolley line companies clogged the city streets. 7,400 horses in use. The electrification of the lines after the companies were consolidated. How Sprague’s electric trolley car invention was proven in Richmond, Va, and then used in Boston. Edison bought Sprague’s company, and folded it into GE. Fascinating stories.