these are the locomotives run on Direct Curent...WCM1, WCM2, WCM3, WCM4, WCM5, WCM6, WCP1, WCP2, WCP3, WCP4, WCG1, WCG2, YCG1 are some examples...after AC-fication of most of the IR network these prototypes become obsolete...only few WCG-2's are maintained by CR...but they also prefer Dual Current locos like WCAM's now-a-days...!!!