The yellow and orange locomotives were built by Atlas Car & Manufacturing Company of Cleveland, Ohio. They were battery powered and came from the two foot gauge line at the Sterling Hill zinc mine in New Jersey. These locomotives are currently being stored at the quarry. The red locomotive is a Whitcomb with a Fordson tractor engine and transmission. It is 33.5 inch gauge and moved slate blocks from the landing to the mills at the quarry until the mid 1970s when trucks took over the job. This locomotive was moved to Ohio last weekend. A second engine remains at the quarry, but will be moved soon to a private collector near Reading, PA. He also owns a third locomotive from the quarry, which was built by Plymouth. A fourth locomotive is preserved at the Blue Mountain Antique Gas and Steam Engine Association in Jacktown (Bangor), PA.
Photos of these locomotives in service are at:
http://news.webshots.com/photo/2050218450095054516IwNaOy