"Al in Vancouver" put an excellent cab ride video on YouTube. He took a cab ride with his father in a CN freight around 1970, from Campbellton to Sayabec and back, and captured it on 8mm.
The train had CN 3205 leading another engine and a mixed freight train, including what looks like some CN passenger cars. 3205 was a MLW C-424 built in 1966. It was leased to Mexico in 1978 and finally sold to Mexico in 1983.
The video features the train going through Morrissey Rock just outside Campbellton, crossing the Matapedia River, and meeting the Scotian passenger train with an F unit on the point. Al told me it was the Scotian and I believe him, especially since the Ocean would have been running in darkness.
There's no sound but the footage is just great. I can't say enough good things about this video! :) Thanks so much for posting that, Al.