According to the book, and interviews with several CN and VIA maintenance employee's, there were reliability issues discovered dealing with the cold weather (brake lines freezing!). But these were resolved within the first year of service. However, even back then, the media was happier to pick nits and find faults than to trumpet successes, and so the persistent rumours of unreliability remained.
On it's test run on the Kingston Sub, the CN Turbo hit a meat truck at a level crossing. It destroyed the truck, but only crushed the fibreglass nose of the turbo, with no derailments and no injuries to anyone on board.
Also, as I mentioned, the Turbo had a 97-98% availability rating. Hardly unreliable. Much more dependable than the LRC units it replaced.
Quite remarkable for a train that had a very short development period, compared to the 10 year development of the LRC, which entered service and were plagued with problems to the end.