The Nevada County Narrow Gauge Railroad & Transportation Museum is a transport museum and heritage railroad located in Nevada City, California. The museum offers a collection of railroad artifacts, photographs, and documents related to the Nevada County Narrow Gauge Railroad, the 3 ft (914 mm) narrow gauge railroad that operated in Nevada and Placer Counties from 1876 until 1942. Exhibits include Engine 5 which appeared in many movies, and various pieces of restored rolling stock. Short excursions on board a variety of railroad equipment are offered in the museum's rail yard. The county's first steam automobile and displays of local aviation history are also presented. Admission is free.