Patent August 27, 1918. 35 Ton Capacity. The jack goes up and down. shown in last two photos.
Vintage Duff Norton Railroad Jack 15 Ton
Vintage Duff Norton Railroad Jack 15 Ton No. 117-AC Working RARE!!
Vintage Duff Norton 1025 Cast Iron Railroad Bottle Screw Jack 12 X 10
Vintage Duff-Norton 2510-C Railroad Ratchet Journal Screw Jack