Old Pueblo Trolley Barn

Old Pueblo Trolley is a non-profit, educational corporation based in Tucson, in the U.S. state of Arizona, that is dedicated to the preservation of Arizona's mass transit history. The name also commonly refers to the heritage streetcar line which OPT began operating in 1993, on which service is currently indefinitely suspended. OPT consists of three divisions that each fill a specific role in preserving the state's mass transit history. The divisions are the Street Railway Division, Motor Bus Division and the Museum Division.

Old Pueblo Trolley's streetcar line opened in 1993. The trolley last ran on October 31, 2011, when service was suspended for construction of the Sun Link modern-streetcar system.Operating on Friday, Saturday, and Sunday, Old Pueblo Trolley ran on just over a mile of single-track line recovered from Tucson's original street railway.