Ridgefielder wrote: Did they really make the run all the way from New York to Montreal without any food service?
Yep. No food service of any kind except what you carried on yourself. I rode the NH-B&M-CV-CN
Ambassador a couple times during its final year (1966) and photographed it a couple more, and it was typically just a CN RPO and two NH coaches behind the power, or sometimes one CN coach and one NH coach for variety. But this was far from the only example of a secondary long distance train in the pre-Amtrak years of the 1960s that lacked food service... that was often a sign that the railroad was doing its best to drop a train but the ICC wouldn't let them.