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Hello All

I have two SD40-2 loco as attached photo (HO Scale, DCC/SND). I use the MRC Prodigy Advance controller. I had intended to connect two loco running consists, but to synchronize the speed, it must be speed matching. So how do speed matching these two locos?

Thanks

544585
544586
 

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If you can use the JMRI decoder pro, it has a page where you can set each speed step to the speed that you want.
In the process, you have to designate one locomotive as your base speed model. Make sure all other locomotives match its maximum speed first. If you don't do that, you will have a loco that outruns some of your other locos.
Going one speed step at a time, adjust each speed step then test it against your base loco on a straight level piece of track.
 
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