This menu was used on the Ambassador, a train that connected Baltimore and Detroit until it was terminated in 1964. The menu is undated, but the prices look like the mid-1960s, so it was probably issued near the end of the train’s run.
The menu is rather sparse, which also indicates a mid-1960s date. It has only four table d’hôte entrées–fish, chicken, pork chop, and sirloin steak. The a la carte side has salads and sandwiches but no fish, chops, or steaks as entrées. The selection and prices are approximately equal to this Union Pacific menu from 1965.