The deceased have been identified as loco driver Bhajan Singh, railway technician Paramjeet Singh and the tractor driver Chotey Lal, police said.
According to a senior railway official, the train pushed the tractor for several meters along the railway track.
An inquiry has been ordered into the incident, which occurred this morning, by the railway to ascertain the cause behind the accident, the officer said.
Senior Divisional Safety Officer has been entrusted with the task of conducting the inquiry and has been asked to submit report within 10 days, the officer said.
