I have the Bachmann Echo Valley Express DCC train set, to which I have added extra track. I'm interested in purchasing another train for the layout and would like something like the "Bachmann-EMD SD40-2 w/DCC & Sound". My main question is can I add any other HO DCC train to my layout? Will there be incompatibility if I go with a different brand train? I just want to be able to easily add another train to my layout and don't want to buy something that will not work, or that would require something additional to work if that makes sense. I have seen where some trains will not run on tigher radius track, i'm currently using the standard oval which I have extended with additional straight pieces of track with switches in the middle. Any guidance would be appreciated.