The "South Park" is a fireless locomotive which differs from a steam locomotive. It has no way of producing its own steam. The boiler was filled two-thirds to capacity and then steam was piped in from the central power plant boiler. As the steam in the boiler diminished, the water in the fireless boiler turned into steam. The engine could operate two to two and one-half hours before it had to be refueled with water and steam. The South Park is believed to be one of the first fireless locomotives used in the United States. It is 24'8" in length and weighs 77,700 pounds.