Yes only CR AND WR were given the training coz that time when the locos were procured it was the time of conversion from DC to AC to run smooth services of trains without disruption. And WCAM3 never went beyond Itarsi and CR crew use to take the loco mostly. Then WR after complete ACfication said no to these locos and handed over its all WCAM2 to CR though at times WCAG1 are seen in WR but rarely. Its actually only crew training and compatibility. Once few months back WCAM2 had gone till Patna with some special. How it went is still a suspense.