#4700 was built in 1931 as the prototype of the P-5 class electric locomotive. Originally designed for passenger service, the #4700 could attain a top speed of 95 mph. In 1939 it was re-geared to perform freight work, with a top speed of 70 mph. #2700 is 62 feet long and weighs 392,000 pounds. The locomotive operated off of 11,000 volt, single phase AC power collected from overhead wires. 64 units were built with the boxcab placing the engineer at the front of the engine which was very dangerous in the event of an accident. 28 units were later built with the cab in the center. Number 4700 is the sole surviving P-5 Pennsylvania Railroad electric engine.