Ottawa LRT

[taylortbb]

https://ottawa.ctvnews.ca/mobile/o-train...-1.5601397

O-Train shutdown enters second week as investigation continues into Sept. 19 derailment

[...]

Last week, the Transportation Safety Board of Canada said the LRT train actually derailed before entering Tremblay Station, approximately 500 metres from the station.

"The train then departed the station in the derailed condition and continued over the rail bridge that traversed Riverside Drive before striking a signal mast and switch heater that were adjacent to and north of track 1," said the TSB.

How did a train travel over 500m while derailed without the driver noticing and stopping? Or a passenger noticing? It seems like something that would make for a bumpy ride.