K-S, Greenfrog, Zona, WKW, TCS or R+T Model Trains

This device is designed to measure the scale speed of locomotives or train cars that past by it. Two small light sensors mounted discretely under the rails are used to record the speed of anything passing over them and then the device calculates and displays the corresponding scale speed on a 3 digit display.

This is the T1A 2-Function DCC Decoder - Control Only - No Harness, Use 9-Pin JST Male (Not Included) by Train Control Systems.

This is the DP5 5-Function DCC Decoder w/Direct 8-Pin NMRA Plug On Board - Control Only - Direct Board by Train Control Systems.

The T-1"-21 is a harness with 1" (2.54 cm) wires connecting a 9-Pin JST to NEM21 socket.

This is the 20' 30-Gauge Wire Blue by Train Control Systems.