[Brian Considine]

QUOTE (locoworks @ 11 Sep 2010, 18:52) <{POST_SNAPBACK}>if you struggle to find a marklin offering, you may pick up an old handheld unit for OO that was designed specifically for shunting. i think AMR did one, and also KPC. they only put out 8 volts over the whole rotaion of the pot to give finer control.

I would be very careful with either of these - AFAIK they are feedback type & a definite no-no for tiny Z-Gauge motors (feedback type controllers make small motors overheat).