Klaus Mikkelsen wrote:
The Roco parts list is for both 3-rail and 2-rail (AC/DC)


Thanks Klaus. That is of course the third possibility - that the Roco parts list covers both DC and AC models.

So it appears, Andrew, that you have a retrofitted DCC decoder in your locomotive, as Klaus wrote. In that case the loco should be ready to roll under DCC digital. All you will have to do is read out the address the decoder has been set to in order to start controlling your loco with a DCC command station.

Cheers
Tom