In a message, he conveyed his condolences to the families of the deceased and offered prayers for speedy recovery of those injured.
Mukherjee called upon the authorities concerned to engage in speedy relief and rescue efforts and asked the people of the area to cooperate with them.
The 37 pilgrims including women and children were killed when the speeding express train ploughed into them in Khagaria district, 160 km from capital Patna.
The incident triggered angry protests by locals who attacked train drivers, set ablaze a coach and vandalised the station.