Prefacing by saying I've never had a Lego train before; so I know very little about this area of Lego. I would like a steam engine with coaches; and as far as I know, Emerald Night is the only official Lego set like that. I have seen tons of amazing steam engine mocs, but haven't found any with free instructions that are similar to the Emerald Night. So EN it is, then. Since it's my first train, I should start smaller anyway.
From what I've read, the PU system is definitely a superior system compared to the older PF IR setup. So, besides the actual PU system, what bricks do I need to buy to help the conversion process be smooth (for example different motor, wheels, plates, etc)?
Thanks!