The collection is comprised of records of the San Pedro, Los Angeles & Salt Lake Railroad Company (1901-1976). The construction of this railroad led to the founding of Las Vegas, Nevada and the creation of the Empire Construction Company and Las Vegas Land and Water Company. The records document the company's operations and include correspondence and contracts relating to lots in the Las Vegas townsite, payments and accounts, invoices and other audit materials from 1905 to 1923. The collection also includes the records of the railroad agent at Arden Station, located ten miles south of the Las Vegas Station, which contain correspondence, ledgers, freight and way bills, shipping orders, and telegrams.

The Elizabeth Harrington Photograph Collection (approximately 1910-1959) is comprised of black-and-white and color photographic prints and negatives. The images primarily depict the Kiwanis Club in Las Vegas, Nevada, as well as the Potosi mine in Nevada. Other images depict early Helldorado parades, airplanes at Anderson Field (Rockwell Field), and First State Bank employees. Also included are images of locations in Las Vegas, including Las Vegas grammar schools, the El Portal Theater, El Rancho Vegas, Fremont Street, Overland Hotel, and the Old Arizona Club. Additional images include portraits of Maude Frazier, Ray Lyman, and Arthur Harrington.