I recently purchased 2 new Bachmann 4-8-4 engines with tenders. I cannot them to stay on the track. My other engines run well. Anyone experiencing this?

Thanks Jim. You put me ease on this. I didn't want to do the wrong thing right out of the box, being new to this. I do have separate power packs for each line. Have a great New Year.

Hutch

I am new to the hobby with a track layout set up for 5 trains. 3 trains are currently powered by conventional dc units. I just purchased my first Bachmann 4-8-4 gs4 steam locomotive with DCC. I plan to put 2 of these on the remaining 2 tracks. Will the new unit run under conventional dc power until I am completely set up? thanks!