you will need another transformer if you are going to run both a the very same time to go with the one you have and i get conflicted stories about the older zw and kw and the new circuit board trains and if you use the fuse holder have a drawer full of 5 or 10 amp fuse for every time one derails pop go's a fuse but never the transformers they say many things and i have yet to fine really good help here at local hobby store about the old transformers with a modern breaker like dose it go off before circuits burn so i just get another new one take to good hobby store who knows what he's doing and but the in phase then you are suppose to be able to run two trains i think as mine a mess right now that 40 dollar cd mistake may not be a bad deal as i have made 450 dollars in bo-boo's but yea it will handled one at a time any transformer do that if big enough
