After a long time a Real Rajdhani had come at Kalyan!
It is also rare because it is departing from platform no.6, none of the igatpuri bound trains are given that platform.
Some of the other known Delhi bound Rajdhani/Rajdhani to have ran/run kalyan are
1) Mumbai Rajdhani (diverted)
2)...
more... Pune Duronto (passes)
3) LTT-NZM AC (regular)
4) LTT-NZM Suvidha (special)