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In an MTH diesel, you have 2 verticle DC can motors, one on each truck, if you are going to change the trucks, you may want to change to a new motor, but the motors that are in the unit are already DC motors, knowing MTH, they are most likely Pittman motors, a good quality motor, so you may want to keep those, if not for this project, then maybe for future projects.... Since the motors are already DC, you have in the electronics in the engine what is called a bridge rectifier, that should be a part of your reversing unit, this is what converts the AC power to DC power for your motors, no O gauge train manufacturer uses the old AC motors anymore, they all use DC motors now, what you have to do is remove all the 3 rail electronics from the engine, the next thing is to insulate the wheels, this can be done using NWSL wheelsets, you might be able to use the existing power trucks, especially if you want to keep using the original motors, diesels are a fairly easy conversion project from 3 rail to 2 rail operation, there are several people on our Otrains list that can do the coversion for you, go to; http://groups.yahoo.com/ Once there, go into the search engine and type in Otrains, this will take you to the information page for Otrains, click on the Otrains name to get into the group website, Otrains is an email list and the archive's are public, so you don't have to be a member to read the archive's, if you would like to join the group, you will need to be registered at yahoogroups, then you can easily join Otrains, which once you see our archive's, you most likely want to do....
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