The 32 mm cut in track was detected by a railway gangman on patrol at 3:15 AM near Mohammadganj village following which senior officers were informed.
Equipment used to cut it was also found near the track.
Senior officers and forensic teams have reached the spot and are probing the matter.
Earlier on February 9, an attempt was made to damage a railway track on Chandausi-Aligarh route near Chandausi railway station here.
There has been a spurt in incidents of damage to track in the country this year.
Railway Minister Suresh Prabhu had told Lok Sabha recently that there had been seven "blast attempts" and three cases of attempted sabotage of rail tracks.
"There have been unusual activities in the last few days and some incidents were averted due to the alertness of railway personnel," the Minister had said.
Railways have cited "outside interference" as the possible reason of derailment in more than 40 such cases this year.
The Railways was now in the process of putting in place latest technology like ultrasonic track detection system to find out fractures so that early warning can prevent mishaps.
Besides technology, Prabhu has said the Railway Protection Force has been asked to evolve a forensic strategy.
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