An express train rammed into a stationary train at Kavarapettai in Tamil Nadu and a few passengers were injured, railway officials said.
The Bagmati Express train, after crossing Ponneri station at 20.27 hours, the crew experienced 'heavy jerk' and after it entered into the loopline, it collided with a goods train.
Kavarapettai, close to Ponneri, is near Chennai in Tiruvallur district.
Six coaches derailed and there were no casualties and a few passengers were injured.
A medical relief van and a rescue team had departed from Chennai central.
Though police said a fire broke out quickly near a coach, railway officials did not confirm it.
Rescue teams and ambulances have rushed to the spot, police added.
Tiruvallur district collector T Prabhushankar, senior state officials and divisional railway manager, Chennai, Southern Railway are on their way to the accident site.
