Hi folks. I'm new to this game and have been working my way through the tutorials. I've gotten to the last two but am stuck. One tutorial is a diesel loco and the other is steam. When I get to a steep incline, no matter what I do the train slows to a crawl, ultimately stopping. I cannot get either to move and then end up going backwards if I can move at all. What am I doing wrong? How do I keep either a steam or diesel loco to have enough momentum to get up the incline? Once stopped how do I think get them to move forward, also on the incline? Any tips much appreciated!