Hi..first time posting in a long time. Rookie, when it comes to railroading so you'll pardon me asking what is probably a very basic question. Here goes:
So last Christmas I bought Bachman's "Jingle Bell Express" set, to use around the holidays.   (https://www.amazon.com/Bachmann-Industries-Jingle-Express-Electric/dp/B00BFCXGGC)   I bought several other track pieces, and I liked the EZ track, and like that it is compatible with newer Bachman track. I found though that the engine  was a little weak at times. Thinking of upgrading. So where shall I begin? Shall I go with Diesel or Steam and the main question is, what is the difference? Can they still both operate on the power system and track that came with that basic set? Can I look at other makers of HO scale engines and use anything on that same Bachmann EZ track? I read somewhere that the best kind of track to use is Nickel? And yet it seems like Bachmann uses a steel alloy...is this cause for concern for me? Any cool recommendations as to what engines I ought to to be considering? Discuss!
Again I'll bet these are easy questions for most hobbyists, but I'd appreciate any feedback that you could help me along with, as I am new to all of this.
Thanks very much.
'Dave in SD'.