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TRAIN CONTROL SYSTEMS N SCALE DECODER ALD4... DECODER FEATURES: This full featured 4 function BEMF decoder is designed to fit the following Atlas N-Scale engines: GP40, SD50 and SD60. 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. This decoder features onboard 680 ohm 1/4 watt resistors for LED's! Dimensions "3.035 x .035" x .13" or 77.09mm x 8.89mm x 3.3mm.