Car 310 was one of four cars delivered to the Jamestown, Westfield & Northwestern Railroad in 1916 by the St. Louis Car Company. These cars were center entrance cars, unlike the 300-305 series which featured doors on each end. The center vestibule separated the coach section at one end from the smoking and baggage sections at the other. Car 310 and its sister 311 were used on heavy runs until 1931 when they were stored and later converted into portable substations in Bemus Point and Mayville.