Summit Diner opened in 1928 and is possibly the oldest diner in New Jersey, out of the 500 in state. It's inside an old railroad car, and it made it onto the list of 30 best diners in the country.

https://summitdinernj.com
https://sueadler.com/the-summit-diner-a-landmark-with-a-hollywood-connection
https://www.tastingtable.com/1942900/old-school-diners-worth-visiting

Update Sept 12th:

is among just 50 historic U.S. eateries awarded a $50,000 grant through American Express and the National Trust for Historic Preservation’s Backing Historic Small Restaurants program.

https://www.facebook.com/photo/?fbid=1266575018837818&set=a.353898980105431