Spokane & Inland Empire, part of the Great Northern Railway System. Spokane, Coeur d'Alene and Palouse (SC&P), Division #1. A mail baggage and express car built by Brill in 1906.
One of two cars (1 and 2) 56 feet long. CERA Bulletin 95 (Electric Railroads of Washington State) has a picture of 2 and roster of equipment. Opearted on 25Hz 6600V AC
Caption data from Bill Vigrass and Bob Townley