| The following information is taken from Don Strack's excellent Utah Rails site (www.utahrails.net), the best source on the web for UP roster data: UPMW 903999 was built new as GE demonstrator 1399, delivered to Union Pacific on 28 March 1947; sold to UP on 8 May 1947. UP 1399 renumbered to UPMW 03999 in October 1956; renumbered to UPMW 903999 in December 1959; used at maintenance of way equipment shop at Pocatello, Idaho, from October 1956 until 1972; sent to Omaha for a complete rebuild in late 1972, completed in February 1973; used as Omaha shop switcher until retirement in 1974. Sold to Diesel Supply Co., in June 1974; sold to General Dynamics, Electric Boat Division, Groton, Connecticut in August 1974, named "Diane"; donated to Danbury Railroad Museum, Danbury, Connecticut in about July 2006. |