CZ6X is the ramp code on my window sticker. I searched around on google maps and found a list of rail yards in the area but this one looks like the most likely place:
Joffre Railyard
100 Canadian National, Charny, Quebec G6X 3S8.
There is a big parking lot with unloading ramps next to the rail yard.
When it gets loaded onto a truck from there it will travel to Sept Iles Qc and end up in another rail yard. From there it will be loaded onto a rail car on the QNS&L railway and be shipped to Labrador City. The dealership is literally less than 1/2 mile from the rail yard there so they just drive them over.