Just got my Son a DCC 4-8-4 Niagara for Christmas and have had a lot of problems with the engine/coal car derailing on turns and sometimes on the turn outs.  We have Bachmann easy track with 18" curves.  Is anyone running this engine with 18" R curves successfully?  We run smaller engines without any trouble with the turns?

What are you using to move the engine back and forth when you program the address?  Depending on the answer to this question, the problem could also be in the decoder or its programming.

The engine moves slightly back and forth automatically when I change its address on the EZ controller. 

I did have the multimeter set to dc.  When I set it to ac, I got a constant 17.1V.  I checked the dc voltage on address 10, but I didn't get any dc voltage. 

I did plug in the analog controller to the EZ Command and was able to run an old Bachmann diesel engine with the analog controller.  The new DCC 2-8-0 steam locomotive didn't run on the analog circuit as the analog diesel, but it runs fine when I power it alone just with the analog controller supplied with the starter set.

I didn't connect the analog and EZ Command controllers separately to the track at the same time, only connected them together as shown on the EZ Command diagram.

Any additional thoughts?  If not I'll call Bachmann on Wed.

Thank you everyone for your responses.  Happy New Year.

I purchased for my son a Bachmann Spectrum train set (The Frontiersman), track extension pack, and the EZ Command controller for Christmas.  I have been able to run the train with the standard analog controller(supplied with the starter set), but cannot get the EZ Command controller to work with the engine.  The locomotive supplied in the starter set is DCC equipped.  I can program the locomotive to specific addresses (engine moves back and forth), but cannot get the locomotive to run by the EZ Command controller.  I put a multimeter on the rails and have .14V with the control knob at 0.  When I turn the control knob I get no more additional voltage to the rails.  I think my issue is with the EZ Command Controller and putting out power to the rails.   

Can anyone give me some direction on what is wrong?