in the early 1970s, the west coast mainline electrification scheme was already planned. taiwan railways had ordered 94 electric locomotives, and also 13 sets of five-car electric multiple units (total 65 vehicles) from england's general electric company (gec). identified as the taiwan railways emu100 series, the set included driving power coach 50ep100, motor coach 55em100, two trailers 40et100, and driving trailer 40ed100.