CPR train number the "Canadian" heads west from Thunder Bay en route to Winnipeg and Vancouver. This location is known as "Dexter.
While we are on the subject of trains ... here we are looking down from the Mackenzie King Bridge at the end of the train sheds at Union Station. It was under these sheds that you boarded your train from Ottawa to Parts Beyond. Date is about 1959, judging by the cars in the parking lot.