Built between 1950 and 1953, the RF-16 Sharknose diesels were cab unit diesel locomotives built by the Baldwin Locomotive Works to the specifications of the Pennsylvania Railroad. Their distinctive contours were reminiscent of Raymond Loewy's design for the Pennsy's T1 class steam locomotive. Baldwin built a total of 160 of these locomotives - 109 A-units and 51 cabless booster B-units. In addition to the PRR, B&O and NYC railroads also operated a substantial number of the "Sharks".