Looking
closely at the picture it appears to be "reversed" like a
mirror image because the lettering on the train cars is
reversed. Several of the cars and the engine are marked
"American Flyer Lines." So, I think the set is American Flyer
S guage. The two rail track further backs this.
I flipped the image and saved it because it was upside down. That
might have reversed the image...
If
this is correct, the set can be run with an American Flyer
transformer. Someone else will have to chime in with
specifics on these transformers.