Last year, October, we took the train from Montreal to Quebec. Booked Business Class at a great price. Luggage was stowed in the same carriage, beverages, snacks and dinner included. Only disappointment was half the trip was in darkness. No Business Class available on earlier trains.
Cab from hotel to station in Montreal, walked earlier in the day but decided with construction and uneven payments cab was the way to go. Quebec hotel was one block from train station and a couple of blocks from port. We walked.
Would I do it again, in heart beat but earlier train.