This is a Lionel 6-81254 O FasTrack O31 Left Hand Remote Command Switch. Features includes 1/4 curve to complete O31 45-Degree curve flawless non-derailing function allows trains to keep running regardless of switch position plug and play using track voltage or auxiliary power auxiliary power and TMCC™ (ASC and SC-2) terminals are conveniently located under the roadbed base making all connections invisible from above realistic illuminated switch lantern. Lantern base is interchangeable can move to the right or left side. Dimensions: Length: 10” Straight 33 3/4-Degree turnout.