The Transportation Safety Board is investigating a collision between two CP Rail trains east of Revelstoke early Sunday morning.
The collision resulted in both trains derailing at the Beavermouth siding 50 kilometres west of Golden at around 2:30 a.m. on Sunday, Sept. 6.
It happened when an eastbound train collided with the westbound train while entering the siding, said Chris Krepski, a spokesperson with the Transportation Safety Board.
Two head-end locomotives and one car on the eastbound train derailed, while one axle derailed on the westbound train.
One train operator experienced minor injuries as a result of the collision.
How the collision occurred is the subject of the investigation. Krepski said investigators will be looking at the locomotive recorder data, examining the track and signal conditions and interviewing people involved.
"We're in the information gathering stage and we will be doing a full investigation into this occurrence," he said.
Krepski said it will take at least a year for the full investigative report to be published.
The TSB is also investigating a derailment that took place on the Stoney Creek Bridge in Glacier National Park in January