to electrify the lines between New York, Philadelphia, Washington, and Harrisburg. In January 1933, through main-line service between New York and Philadelphia/Wilmington/Paoli was placed in operation. The first test run of an electric train between Philadelphia and Washington occurred on January 28, 1935. On February 1 the Congressional Limiteds in both directions were the first trains in regular electric operation between New York and Washington, drawn by the first of the GG1-type locomotives. In 1934, the Pennsylvania received a $77 million loan from the New Deal's Public Works Administration to complete the electrification project begun in 1928. Work was started January 27, 1937, on the main line from Paoli to Harrisburg; the low-grade freight line from Morrisville through Columbia to Enola Yard in Pennsylvania; the Port Road Branch from Perryville, Maryland, to Columbia; the Jamesburg Branch and Amboy Secondary freight line from Monmouth Junction to South Amboy; and the Landover-South End freight line from Landover, Maryland, through Washington to Potomac Yard in Alexandria, Virginia. In less than a year, on January 15, 1938, the first passenger train, the Metropolitan, went into operation over the newly electrified line from Philadelphia to Harrisburg. On April 15, the electrified freight service from Harrisburg and Enola Yard east was inaugurated, thus completing the Pennsy's eastern seaboard electrification program. The railroad had electrified of its track, representing 41% of the country's electrically operated standard railroad trackage. Portions of the electrified trackage are still in use, owned and operated by Amtrak as the Northeast Corridor and Keystone Corridor high-speed rail routes, by SEPTA, and by NJ Transit. Equipment The Pennsylvania Railroad's corporate symbol was the keystone, the Commonwealth of Pennsylvania's state symbol, with the letters "PRR" intertwined inside. When colored, it was bright red with a silver-grey inline and lettering. Freight cars The Pennsylvania Railroad bought its first 75 freight cars in 1849. Two years later, the Pennsy owned 439 freight cars. By 1857, it had 1,861 cars, and in 1866, 9,379 cars. Freight equipment was either acquired new from builders or built by the railroad itself. The Pennsy acquired more cars from the railroads it absorbed. In some instances, privately owned cars were either purchased from a builder or railroad acquisition. One such example was the 1877 purchase of Empire Transportation merchandise and oil cars. By the mid-1860s, the railroad had 9,379 freight cars; a decade later, 32,718; the mid-1880s, over 49,000; 1896, more than