Historical clue formulations

• Greasy spoons — 2023-02-03
• Certain restaurants … or their customers — 2023-01-30
• Informal eateries — 2021-08-03
• Greasy spoons — 2016-08-14
• Folks working on courses? — 2014-07-19
• Some Amtrak cars — 2000-05-14
• Greasy spoons — 1996-07-29
• Restaurant patrons — 1996-04-29