Hi, my son currently has many lionel trains (sets) and he really wants a bachman for christmas.So I want to do that for him, but I don't know where to start. Do we buy the thomas set and then add percy, and how does that work?What would should I buy? If someone could tell me what to buy. He watches videos on youtube and wants something called dcc remote controlled percy, but from what I can see, I have to buy a thomas set first? The tracks from the lionel definitely are different from the ones he watches on youtube. He is 14, nonverbal autism and this is his passion.  Thank you!!