San Pedro and Southwestern Railroad

The San Pedro and Southwestern Railroad (reporting mark SPSR) is an Arizona shortline railroad, currently operating from a connection with the Union Pacific Railroad (UP) at Benson, Arizona, seven miles to Curtiss, Arizona. The SPSR formerly ran a total of 76.2 miles (122.6 km), with main track from Benson to Paul Spur, a location about 10 miles (16 km) west of Douglas, as well as the Bisbee Branch which ran 5.6 miles (9.0 km) to Bisbee, Arizona. The SPSR is owned by David Parkinson's "Arizona Railroad Group". David Parkinson has owned several other shortlines in California, such as the California Northern Railroad, under his ParkSierra Rail Group, now a part of RailAmerica. The San Pedro and Southwestern Railroad commenced operations in November 2003 when it purchased the San Pedro and Southwestern Railway (reporting mark SWKR) from RailAmerica.

David Parkinson acquired the line from RailAmerica in 2003 with "the intent of restoring transborder rail service with the Mexican rail system at Naco, Arizona, and developing North American Free Trade Agreement-related traffic, but that this plan never materialized."