A rail fracture near St. Thomas Mount railway station on Friday delayed EMU trains for about 15-20 minutes.
Traffic was streamlined after two hours, railway sources said.
A motorman on an EMU service proceeding towards Chennai Beach alerted railway officials about the possible rail fracture around 6 a.m.
It was immediately attended to by railway staff.
Though no services were cancelled, EMU trains were run with caution at the spot of the fracture.
It was rectified around 8 p.m. and normalcy returned thereafter, railway sources said.
