 Proposals for historic streetcar service along The Embarcadero were first put forward in 1974, and the first mention of separate E Embarcadero and F Market lines was in 1981.In 1987, a temporary, demonstration streetcar service was operated along part of the Embarcadero as part of the 1987 San Francisco Historic Trolley Festival, to gauge public interest in, and the practicality of, a regular streetcar service.It ran along then-existing, but disused, San Francisco Belt Railroad tracks and operated two days a week for a little over five weeks, using two streetcars powered by electricity from portable diesel generators.