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You shouldn't need a resistor, Ive never used one and that includes some MRC decoders. NMRA standards state that a programming track should provide a low power DCC signal, this is to protect an improperly installed decoder from damage should it receive full layout current. As the MRC/Gaugemaster prodigy advance has a seperate programming track, and is NMRA compliant, you don't need a resistor as there is built in protection in the system.

I've just read that page and I can see what they are saying, however if you place the loco on the programming track, and can program it and readback it's address then you can be sure the decoder is working fine and is installed properly, so you don't need a special test track.

Such things may have been necessary before we had seperate programming track outputs on systems, but I don't really see a point to now.
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