This is an On3/On30 tender for the Southern Pacific narrow gauge 4-6-0 #18, SC-34-3. This version used the Bachmann 4-6-0 trucks, electronics and wiring. It requires tapping holes and cutting and soldering wires to complete. It uses Kadee On3 couplers and the On3 coupler height. (At some point there should be a version with the correct SP tender trucks.)
