Know About Locomotive WDS–6
Heavy-haul shunters made in large numbers for industrial concerns as well as for IR, starting in 1975. These locos consist of the YDM-4 powerpack (6-cylinder 4-stroke inline Alco engine, turbo-supercharged) placed on WDM-2 frames. Same bogies as the WDM-2, WAM-4, WCAM-1 locos (Alco cast asymmetric trimount bogies). 1200/1350hp net (1400hp gross). Max. speed 62.5km/h. Several of them have a so-called ‘creep control’ system which allows them to be operated at a sustained speed of between 1 to 7 km/h for hauling special or heavy loads.
The first ten were numbered #19459-#19468 but later renumbered as they were all allocated to public-sector industrial concerns. (The same numbers were later allotted to WDS-4 units.) Many of the later units built for IR (as opposed to the earlier ones which went to the public-sector concerns in large numbers), numbered #36000 and above, are classed WDS-6R. A few locos of a variant design classified WDS-6SL were sent to Sri Lanka (Puttalam Cement Co.). Some units (#36255-#36265, #36501-#36503) are designated WDS-6AD. The exact differences from the base WDS-6 model are unclear. Some of these are built (modified) by the Parel Workshops.
Engine: Alco 251D-6, 6 cylinder in-line
Wheelsets: Alco asymmetric cast Co-Co trimount bogies.
Length over buffers: 17370mm
Wheel Diameter: 1092mm
Axle load: 21 tons.