Electrification was the solution to moving more trains with more cars and faster acceleration than steam locomotives could handle. The catenary, partly financed by the Federal government during the Great Depression as an economy stimulus, is still used today by Amtrak.
Pennsylvania Railroad GG1
No. 4935
Throughout their lives, the GG1s were painted in various colors, with the Brunswick green (almost black) the most remembered. The design was called GG1 by the Pennsylvania Railroad because the wheel arrangement was the same as two Class G (4-6-0) steam locomotives coupled back to back.