If you want true chuffing smoke from the Williams and the Hudson, you'll have to consider upgrading to a fan driven smoke unit. The Lionel Big Boy has fan driven smoke, but it run continuously. In any of these, to get chuffing smoke with the fan driven smoke unit, one excellent solution is my Super-Chuffer II, it gives you chuffing smoke, smoke at idle, and adds some lighting features as well.
The Hudson and Rock Island are both AC motors, so they'd be using the AC Commander.
If you're looking at doing this yourself, I'd pick one of them, plan and do the upgrade. This will give you a basis for the complexity of the job and for ordering additional stuff to do the next batch. It's a lot easier to guide you through one upgrade than a whole raft of them at once.
