According to sources, Rawat was not taken into confidence before naming Karn the captain.
Mahesh Rawat's fluent half-century kept Railways with a bright chance of getting the first innings lead.
Gurkeerat Singh Mann finally took the team to victory as he reached yet another half-century.
Yuvraj had a forgettable outing during Railways's trashing of Punjab.
Bengal lost early wickets, but then recovered. The game is still in the balance.
Anureet Singh keeps Railways in the hunt for semi-final spot.
Bengal who resumed on 274 for eight on Day 2 were bowled out for 317 in their first innings.
It will be interesting to see how Bengal soak up the pressure against an under-rated Railways.
Uttar Pradesh sealed their berth in the Ranji Trophy quarter-finals after their final match.
Ghosh and Rawat hit unbeaten centuries to take Railways to a solid 460 for four.