DeRoI-class locomotive (Toshiba)

The Toshiba DeRoI class was a group of boxcab electric locomotives with regenerative braking, type EL14AR, built by Toshiba from 1943 for the Chosen Government Railway, known as Sentetsu, in Korea, and able to work in multiple-unit control. They closely resembled the DeRoI locomotives built by Mitsubishi and the DeRoNi class built by Hitachi, although the major design work was done by Mitsubishi, and the Toshiba units differed in the spacing of their side windows, the shape of their ventilators and their deck railings. The project was Sentetsu's 1938 requirement for a state-of-the-art electric locomotive and included the first use of regenerative brakes on this design. After the partition of Korea most of the locomotives ended up in North Korea, where they were reclassified Chongiha in 1956 and refurbished for the first electrified line there.