The City Line Diner was located at 1946 Paxton Street, Harrisburg, PA. It was built by the Jerry O’Mahony Dining Car Company,  and opened on October 25, 1940. It was originally owned by C.H. Wertz Jr. The diner sat 36, 22 at stools, and another 24 at six booths. It was painted the usual 1930s-1940s color scheme of white and green.

According to an article from the opening, at the time of its construction, this was one of the widest diners in Pennsylvania, which necessitated that its transport from New Jersey be entirely by truck, instead of the usual rail transport. Police had to close roads for its transportation, as it took up both lanes of the two lane highways upon which it traveled.

The diner was replaced in 1956 with Mountain View no.478. It was demolished in 1981.