The throttle and power supply is now hard wired in the location (engine service) that I built it for. It has 1 amp of power that is sufficient for moving any one engine at a time. Mainline throttles should have 3 amps of power for powering multiple engines like double or triple headers.

You can bearly see the MRC Tech 2 stationary throttle at lower right that has been around thirty years. It still works fine, I just wanted to go with a hand held unit. The Tech 2 is now used only for powering the turn table as it has a fixed DC output and the AC terminals power the roundhouse and yard lights.

Half the modelers out there still run DC as I do so I'll tell others how to build it if interested. There is an on/off switch on the upper right because the system is always on at it puts out 2 volts even when the speed control knob is turned off. This allows the engine to move at a slight crack of power. The forward/reverse switch is at the lower front. Forward is in the up position and reverse down.

The filtered DC power supply is at right with the 1.2 amp transformer in the same box. These are from Radio Shack as well as the switches, resistors, diodes, electrolylic capacitor, power transistor and transformer. The wire wound potentiometer and signal transistor came from Mouser Electronics. The 16 gauge copper stranded automotive wire between the two boxes came from Auto Zone.