Question: what is the difference between o and ho scale trains?
Answer: For starters, HO and O are completely different scales. HO is 1:87, while in the U.S. O scale is 1:48. ... However, the 3-rail track uses A.C. current, while most scale trains use DC (Marklin excepted). I would suggest going to HO, since scale O takes up a lot of space.