Passengers who boarded The Nilgiris Mountain Railway (NMR) at Mettupalayam on Sunday morning reached Coonoor Railway Station after a three-hour delay.

According to railway sources, the fall of a boulder on a stretch of the railway track near the Hill Grove Railway Station and the consequent damage to the track forced the loco pilot to stop the vehicle at the station.

The train left the Mettupalayam Railway Station around 7.30 a.m. to reach the Hill Grove station around 8.45 a.m.

The train remained there for two hours after the department staff alerted the authorities concerned that the track at the stretch, which included a bridge, was damaged.

The damaged portion measured around four feet, the sources said