The GN boxcab locomotives were the first electric locomotives purchased by the Great Northern Railway (GN) for use through the Cascade Tunnel.

Four locomotives were 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 115 short tons (104 t) each.

[2][3] They were three-phase electric locomotives with specifications calling for 1,000 hp (750 kW), but the actual output was substantially greater at 1,500 hp (1,100 kW) each, as described by the consultant engineer Cary T.

[5] Initially, three locomotives were coupled together and hauled trains at a constant speed of 15.7 mph (25.3 km/h),[6] but when larger trains required four locomotives the motors were concatenated (cascade control), so that the speed was halved to 7.8 mph (12.6 km/h) to avoid overloading the power supply.

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