Well.... you'd think I'd learn by now!
I saw a MTH Hudson and thought that a running sample meant it would be more complete. It would have a board set and maybe a smoke unit. 
Nope. 
It was a prototype and doesn't have many things that must have been added later on. Like extra power pick-up points and so on.
At least I know I can grab some parts from MTH still. Many weren't available but I may have enough now to move forward at least.
When I'm done, I could have bought a RTR engine for less. What fun would that be?
