The museum holds in its collection thirty-three Diesel locomotives, one electric locomotive, one steam locomotive, eighteen passenger cars, numerous freight and maintenance cars and sixteen cabooses. They offer excursions and a "Run A Locomotive" program during the summer. The WPRM has one of the larger collections of early Diesel era locomotives and freight cars in North America. The museum is often considered to have one of the most complete and historic collections of equipment and materials from a single railroad family. The holdings also include extensive corporate records and images, as well as personal collections from those who worked for the Western Pacific. The WPRM is a "hands-on" museum that allows visitors to board and explore locomotives and cars in their collection. Among the significant pieces in the WPRM collection are Western Pacific 805-A, an FP7 model passenger locomotive that pulled the California Zephyr; Southern PacificEMD GP9 #2873, nicknamed "the Kodachrome" by the volunteers, due to it being painted with the Kodachrome scheme from the failed Santa Fe–Southern Pacific merger; WP 2001, the first GP20 model locomotive ; WP 501, an early switch engine and the first Diesel purchased by the Western Pacific; Western Pacific 0-6-0 steam locomotive 165, an oil burning switch engine built by ALCO in 1919; WP 37, a 200-ton rail-mounted crane, two track clearing snowplows ; and several rare, early 20th century freight cars. Also located at the site are the Portola Diesel Shop, built in 1953, and an interlocking tower from Oakland, California, currently stored unrebuilt. The Western Pacific Hospital, built in 1911 and one of the few remaining railroad hospitals in the country, was part of the museum until it was destroyed in an arson fire on September 7, 2011. The WPRM prides itself on maintaining several of their road Diesels in mainline operating condition and is well known for making occasional movements on Class I railroads using their own historic motive power.
One aspect of the Western Pacific Railroad Museum is its nationally known Run A Locomotive program. Except for winter and certain weekends when special events are in progress, the museum provides visitors a chance to be an engineer for an hour. Participants are given on-the-ground instruction, then they get to operate a real locomotive of their choice for an hour. A qualified engineer joins them in the locomotive for oversight and further instruction. This is one of the first programs of its type in the United States. More information can be found at . The program is so popular that it is often reserved months in advance.
Zephyr Project
The Zephyr Project is a program of the Feather River Rail Society to acquire, preserve and restore cars, locomotives, personal stories and artifacts relating to the California Zephyr passenger train. Currently, the Project's collection of equipment includes Western Pacific FP7 locomotive 805-A, dome lounge car "Silver Hostel", dome-coach "Silver Lodge" and dining car "Silver Plate". In addition, the dome-coach "Silver Rifle" is on long-term loan from the Golden Gate Railroad Museum.