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The ScaleTrains N Scale SD40-2 is a great runner, but it is even better when paired with a Protothrottle!

In this tutorial I show you how to program the SD40-2 using the ESU LokProgrammer to work even better with the Protothrottle, slowing down the speed and matching the thottle notching better.

I based this tutorial on the excellent video from Tim Garland ( @SeaboardCentral  YouTube channel –, so thank you, TIm! If you don’t know the Protothottle, head over here –