Nice photo. " In 1910 the Pennsylvania Railroad had completed its terminal in New York City, which was connected by tunnels to New Jersey, and under the East River to Long Island. At Sunnyside the large yard of the Pennsylvania Railroad was constructed. An agreement was made with that Railroad and the Pennsylvania Tunnel and Terminal Railroad Company whereby the cars of the Long Island Railroad would be carried through the tunnels under the East River into the Terminal at Seventh Avenue and Thirty-second Street, New York. Thus the Long Island Railroad acquired what successive administrations had striven for in vain, a terminal on Manhattan Island. In order to reach this terminal it was necessary to electrify from Jamaica to New York, which was accomplished in 1910, and the first train run into the Pennsylvania Station on September 10th of that year. Felix E. Reifschneider's 1925 Long Island Rail Road History"
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Pennsylvania Tunnel and Terminal Railroad , East River Division, Sunnyside Yard map from "Transactions of the American Society of Civil Engineers", hardcover edition 1910. Info: John Fusto
More info here:
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LIRR Yard A was north and adjacent to the massive PRR Coach Yard and service facilities.
Extensive documentation by George Chiasson, Jr.:
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Best I know LIRR never had trains in Sunnyside... PRR only.