The driver of the transport vehicle was among those killed, SHO, Government Railway Police, Hisar, Bhim Sein said.
He said the train from Dhuri in Punjab was headed to Sirsa in Haryana when the accident occurred near village Sarsod, about 30 km from here.
The victims belonged to village Balak here and were on their way to attend a religious function when the mishap took place, with low visibility due to fog being stated as the possible reason for the mishap, police said.