 When the Yellow Cars stopped running in 1963, the building located along the city's old Mexican marketplace, Olvera Street, was converted to other uses.However, critics of the structure argued it was out of keeping with the pre-1900 flavor of Olvera Street and sought to remove it.In 1971, the Pueblo park's historian, Dr. Doyce Nunis, issued a report stating that the substation had "no identifiable historic value".