Great, thanks for the above, done a few tests today, my new engines go up no problem, a little slippage on my old one. The incline goes up to 4 inch. I'm aiming to reduce this to 3 half inch probably.
I'll update my own page shortly with progress. Ps what tunnel make are you using, I'm trying to find a double track one that's fairly narrow with not much height to it as the trains will go under a second tier,