The Transportation Safety Board says it is in the final stage of its investigation into the derailment of A VIA rail train in Burlington a year ago today.

In an update, the TSB says the train was travelling at almost 108 km/h when it derailed, killing three engineers and injuring 45 people including 44 passengers and a VIA employee.

TSB Investigators found the train was going four times faster than it should have been during a track switch.

But the agency did find the locomotive and passenger cars "were well maintained and their mechanical condition did not play a role in this accident."

The train was enroute from Niagara Falls to Toronto when it left the tracks, rolled onto its side and slammed into the foundation of a nearby building.