Hi,
The change in route happend around Jan, 2012. I remember seeing this train cross Chanakyapuri back in Nov 2011. Then around Jan 2012 I was surprised to see this train cross NZM. Check the timeline of 12213/12214, it also had a technical halt at DSJ.
The...
more... change in zone from NR to SWR happened around Dec 2012, when YPR-KCVL AC Express was being planned (it's RSA partner).
Also, earlier it had a tech halt at ET and would skip RKMP, BPL. This switch in halt from ET to RKMP happened relatively recently.