A city work crew had to scramble off a bridge two years ago to avoid an oncoming O-Train because the operator didn't know they were there.
The "near-miss situation" is one of 14 dangerous incidents in Ottawa since 2000 reported to the Transportation Safety Board and released to the CBC under an Access to Information request.
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None of the 14 Ottawa incidents resulted in collisions, derailments or injuries, but there were a few close calls.
For the most part, the incidents involved trains — including VIA passenger trains — proceeding down the track without proper authorization.
O-Train incident prompted city to change rail work rule
In one incident in 2001, a passenger train overshot a stop signal at Ottawa's main VIA Station. The crew was removed while rail officials investigated.
Later that same year, another VIA train had to brake suddenly to avoid a possible collision with some heavy equipment at a crossing.
Several incidents involved communication breakdowns between rail authorities and work crews on the tracks.
In 2010, a CN freight train had to brake suddenly to avoid a crew on the Rideau River bridge.
And in July 2011, in what the TSB classifies as a "near-miss situation," city workers inspecting another bridge over the river had to scramble to avoid an O-Train approaching at 55 kilometres per hour.
As a result of that incident, the city decided all non-essential track maintenance must be performed overnight when the O-Train's not running. Daytime work requires special permits.