Definition of "Pennsy"

[page 32, caption] Pennsy's postwar Q2 employed the duplex-drive layout to ease the main-rod load and improve steam distribution on what otherwise would have been the 4-10-4 wheel arrangement. The role of unifying the insolvents into a truly national system fell to U.S.-born and Pennsy-trained Sir Henry Thornton (who went to Canada via the Long Island and England's Great Eastern).

1959, David P. Morgan, editor, Steam's Finest Hour, Kalmbach Publishing Co., pages 32, 112