I recently picked up at an estate sale 4 ETS sets, complete except for the transformer. The set came with Lionel 3 rail O-27 track. The question I have is will a standard ZW or other compatible work with these sets, or do I need a HO transformer to run them. I'll admit I got them on the extremely cheap. one is a passenger set, beer car set, mixed freight and the last mixed passenger with freight.
Thank You
Hmsjr