Tell us what control system you have ?.. If you are older analog DC, good luck......
If you are newer DCC you can consist, triple head, and speed match a Bachmann 2-8-0 steam engine with an Athearn SD45 diesel and a brass Brill trolley car if they are all DCC, too..
So............
PS. Sorry. I typed this up before noticing the O scale category... which is probably 3 rail.
Buy I'll leave it posted just for the halibut...M