Keywords: PRR M1a detail.jpg Detail picture of a Pennsylvania Railroad M1a steam locomotive at the New York World's Fair 15 July 1939 http //www loc gov/pictures/collection/gsc/item/gsc1994000211/PP/ Transferred from http //en wikipedia org en wikipedia; transferred to Commons by User Kelly using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper 1939-07-15 Original work http //www loc gov/pictures/related/ fi name q Gottscho-Schleisner 2C 20Inc co gsc Gottscho-Schleisner Inc photographer Derivative work Morven at http //en wikipedia org en wikipedia PD-AUTHOR; Released into the public domain by the author Morven at http //en wikipedia org en wikipedia Original upload log page en wikipedia PRR_M1a_detail jpg 2004-11-27 21 12 Morven 308×388× 30116 bytes <nowiki></nowiki> Pennsylvania Railroad M1 Locomotives in the 1939 New York World's Fair |