K-Line by Lionel No. 6-21397 SuperSnap O-31 Remote Control LH Switch, MINT OB. Motor driven and smooth operating, this popular switch is compatible to all brands of tubular O-gauge 3-rail track. Switch has: micro-motor power; LED indicators; non derailing feature; low-profile switch housing. Can be operated on fixed or variable track voltage. Switch has a blackened center rail and will snap together or can be connected with pins. Please e-mail me with any questions. Thanks for your interest and participation!