Know About Locomotive WDS–4, WDS–4A, WDS–4B
CLW produced some of these diesel-hydraulic locos beginning in 1967-1968, but bulk production began only in 1969. (Some of the later units were probably built at the Diesel Loco Works, Varanasi.) WDS-4BWheel arrangement: ‘C’. 6-cylinder 4-stroke turbo-supercharged engines. WDS-4 models are rated at 600hp, WDS-4A at 660hp, and WDS-4B at 700hp. (The same power-pack is used on all the models, upgraded for each.)
Many of these were used by public-sector units and some private companies for industrial uses. (These are the only IR locos in use today with hydraulic transmission.) WDS-4B numbers are shared in a range with WDS-4D locos. The first WDS-4A, #19057, named ‘Indraprastha’, was homed at Shakurbasti for a long time (still is [10/05]) but is due to be decommissioned and sent to the NRM shortly. Some WDS-4A locos (e.g., #19063) have over the course of time ‘lost’ their sub-class marking and are marked simply as WDS-4 — it’s not clear whether this is just a sloppy job by the painters or indicates some real variation in the locos.
Engine: Mak/CLW 6M 282 A(K), slight variations and power differences for WDS-4A, WDS-4B, etc.
Transmission: Mak-Suri 2-speed hydromechanical transmission (WDS-4), Voith hydraulic transmission (WDS-4A), Suri hydromechanical transmission (WDS-4B)