The mission of the San Diego Model Railroad Museum is to preserve the heritage of railroading through a series of miniature representations of California railroads.
The museum is a non-profit organization that was incorporated in 1980. At 24,000 sq. ft., the museum is the largest indoor model railroad display in the world. The individual HO and N scale layouts are among largest of their type. Since its opening to the public in March of 1982, the museum has had over two million visitors.
The museum is located in the Casa de Balboa building in Balboa Park, the museum has four scale-model railroad layouts that detail the geography and historical development of railroading in Southern California. A hands-on model railroad for children also is offered. Admission to the museum is free on first Tuesday of the month.