Great Northern boxcab (3 phase)

The GN boxcab locomotives were the first electric locomotives purchased by the Great Northern Railway for use through the Cascade Tunnel. Four locomotives supplied were built in February and March 1909 by the American Locomotive Company, and delivered in Pullman Green; they used electrical equipment from General Electric and weighed each.
They were three-phase electric locomotives with specifications calling for, but the actual output was substantially greater at each, as described by the consultant engineer Cary T. Hutchinson. They had a B-B wheel arrangement. The GN numbered them 5000–5003 and they were used until May 1927, after which all were scrapped.
Initially, three locomotives were coupled together and hauled trains at a constant speed of, but when larger trains required four locomotives the motors were concatenated, so that the speed was halved to to avoid overloading the power supply.