The Chadwick Square Diner or Worcester Lunch Car Company Diner #660 or Ralph's Chadwick Square Diner is an historic diner at 95 Prescott Street (rear) in Worcester, Massachusetts. Although the building faces Grove Street, it is attached to one of the 19th century Washburn and Moen Works buildings which fronts on Prescott Street. The diner is a rare early version of a streetcar-inspired design, and may be the only one of its type in the state.