This menu has no date code, and it offers more items than shown on yesterday’s breakfast menu, but those items that are in common have the same prices. It also has the same Tilden ad on the back, suggesting it is from 1960.
Click image to download a 2.1-MB PDF of this menu.
Both of these menus say they are for “dining car service,” rather than dinette or buffet service. This one may have been used on a longer-distance train, which would explain why it offers a few more items.