Indian locomotive class WCG-1

The electrification of the line from Kalyan to Pune and Igatpuri in the 1920s required powerful electric locomotives to handle trains over the 1 in 37 grade. With the order being made in 1926, the first 10 locomotives were built by SLM in Winterthur, and the remaining 31 were built by Vulcan Foundry in Newton-le-Willows. The electrical components of all 41 locomotives was built by Metrovick, based on drawings by Brown, Boveri & Cie, Baden, Switzerland. These were the first electric locomotives built by Vulcan Foundry. The locomotives were used in front of freight trains on the GIPR's Bombay-Pune and Bombay-Igatpuri routes, but were also assigned to bank trains on the up to 3% steep Bhor Ghat gradient. They were referred to by the staff as खेकडा [Khēkaḍā], English 'crab', and distinguished themselves by being able to negotiate curves well on mountain ranges. It is often mentioned by locals that the locomotives made a strange moaning sound when standing and made a wiping sound when driving, which was typical for most crocodile locomotives. The first locomotive was named Sir Leslie Wilson, who was governor of Bombay from 1923 to 1928. The nameplate is fitted on locomotive no. 4502, which is on display in the National Rail Museum of India. == Design ==

The total weight of the locomotive was 123 t, with the mechanical components weighing 72.25 t and the electrical components 50.75 t. The locomotive has two bogies with three coupled axles, which were driven by an SLM inclined rod drive. The drive axle was the third axle in the bogie, the drive was from a double drive motor via a blind shaft, which is arranged between axes 1 and 2, on the drive and coupling rods. The two powered bogies, on which the pulling and pushing devices were also attached, had lower structures in which the traction motors and the reversing switches were housed. The locomotive box with the two cabs connected the two powered bogies. The locomotive was able to drive arches with a radius of . The 650 hp traction motors had winding designed for 1500 V. The following groupings were possible: all four motors connected in series and two motors in series connection in parallel to the other two motors in series connection all traction motors in parallel. The electro-pneumatic control had nine speed levels - three in each grouping. There was also an electric useful brake that worked in the speed range from to . The excitation of the traction motors was ensured by an axle generator. The locomotive was fitted with a vacuum brake, the brake of the locomotive itself being designed as a vacuum-controlled compressed air brake. There were two vacuum pumps and two piston compressors, the compressors being driven by 1500 V motors supplied directly with the contact line voltage. The sand spreaders working with compressed air discharge could be operated via a pedal. The pantographs could be raised and lowered using a manually operated compressed air valve. A compressed air pipe was available as an acoustic warning device. == Preserved examples ==

File:GIPR EF-1 at CSMT Heritage Gallery.jpg|One of the surviving EF-1 (WCG-1) locos at the Heritage Gully at CSMT. View from Cab-1 Side File:GIPR EF-1 at CSMT Heritage Gallery- Front View 01.jpg|One of the surviving EF-1 (WCG-1) locos at the Heritage Gully at CSMT. View from its Cab-2 Side ==See also==