Pennsylvania RailRoad promotional film from 1955. Highlights the early intermodal road / rail 'piggback' services being introduced at the time. The Pennsylvania Railroad (PRR) was an American Class I railroad, founded in 1846. Commonly referred to as the "Pennsy", the PRR was headquartered in Philadelphia, Pennsylvania. The PRR was the largest railroad by traffic and revenue in the U.S. throughout the first two-thirds of the twentieth century and was at one time the largest publicly traded corporation in the world. At its peak, it controlled about 10,000 miles (16,000 km) of rail line; in the 1920s it carried about three times the traffic (measured by ton-miles of freight) as other railroads of comparable length, such as Union Pacific or Santa Fe. The only rival was New York Central, which carried around three-quarters of PRR's ton-miles. . . WDTVLIVE42 - Transport, technology, and general interest movies from the past - newsreels, documentaries & publicity films from my archives.