The class WDS-1 was a diesel-electric locomotive used by Indian Railways for shunting and carrying out departmental works. The model name stands for broad gauge (W), Diesel (D), Shunting (S) 1st generation (1). The WDS-1 is used mostly in the Northern Railway Zone (NR). All these locomotives were withdrawn by the late 1990s.
During WW2 the USATC took effective control of the ports of Bombay, Calcutta and Karachi and to operate them obtained 50 General Electric built Bo-Bo diesel locos; these were a standard General Electric45 ton design of locomotive. When delivered to India the locos were split between the BAR[expand acronym], the Bombay, Baroda and Central India Railway (BB&CIR), the Great Indian Peninsula Railway (GIPR) and the North Western State Railway (NWR) and were used for working military traffic between the ports and mainline railways. After the war they became the property of the mainline railways and in turn became IR locos. Post war they were designated as ADE class and on IR they were WDS-1 class. One unidentified member of the class has been preserved and is now[when?] at the Diesel Locomotive Works (DLW), Varanasi.
Upon the departure of the Americans, the locos all became part of the stocks of their respective companies. In August 1947, 14 of the locos fell under ownership of Pakistan Railways. All NWR examples were among these, along with two each from BBCIR (6500-01), GIPR (6526-27) and the BAR pair. They became their ADE36 class with the running numbers 6501 to 6514. The ones that remained in India became ADE class locos and were numbered 410 to 425. All but one of these 15 became WDS-1 class locos and received the numbers 19000 to 14. The missing loco was sold to CLW[expand acronym] for use as their works shunter where it remains albeit now preserved.[as of?] The WDS-1 were another long resilient class as one was in 1992, at Sealdah.
