The dark green F7 A unit locomotives are lettered and striped in orange. By 1982, the two remaining F’s were demoted to “B-unit” status because of their older, obsolete brake system. In September of 1984, several of the founding members of the Feather River Rail Society acquired their first acquisition, Western Pacific F7 #921, housed in the old WP Diesel shop in Portola, now a world class railroad museum The EMD F7 was a 1,500 horsepower (1,100 kW) Diesel-electric locomotive produced between February 1949 and December 1953 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD).