TOKYO, Jan 16 - A railway power outage in Tokyo disrupted the morning commute for thousands on Friday as two main lines with some of the world's busiest stations were halted after reports of a fire.

Trains on East Japan Railway's Yamanote and Keihin-Tohoku lines were halted in all directions with no timetable for resumption, the railway said.

A fire was reported on the tracks near Tamachi Station, where both lines stop, shortly before 8 a.m. (2300 GMT on Thursday), public broadcaster NHK said. Flames were coming from a transformer in the track area, and the fire was nearly extinguished about 30 minutes later, NHK said.