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The Confederation Line LRT conked out for most of the day Wednesday because of what appears to be a technical issue.

According to a written statement from transit operations director Troy Charter, “three radio units that are part of the control system needed to be reset” and three trains stopped in the tunnel “as per protocols.”

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Two of the trains were taken to Tunney’s Pasture, Charter said. The third train returned to operations in the east end until radios were reset.

It was around 4:30 a.m. that the transit operations control centre discovered that the radio units that communicate train locations in the western leg of the rail line had been tripped to the off position, Charter said.

Trains were not running between Tunney’s Pasture and Hurdman stations, but service continued between Hurdman and Blair stations, he said.

“The cause of the radio shutdown is under investigation with one possible cause being (the overnight) thunderstorm,” Charter said.