TRAIN CONTROL SYSTEMS N SCALE DECODER K1D4-NC... DECODER FEATURES: This full featured 4 function BEMF decoder is designed for the N-Scale Intermountain SD40T-2, SD45T-2, and SD45-2 locomotives. Included is Train Control System's auto-adjusting BEMF for outstanding slow speed performance and hassle free set up. Also includes Quiet Drive for super quiet engine performance. Dimensions 2.427" x .351" x .106" or 61.64mm x 8.92mm x 2.71mm.