ozinoz wrote:Many thanks for the gradient tutorial - something to occupy idle hands should they appear over Easter. I will get out of the yard in the tutorial scenerio eventually or die in the attempt

The trick is, just before you reach the start of the slope, throw the reverser fully forward and give it some more throttle. If the steam chest pressure is as high as the boiler pressure, ease off the throttle. It's like driving a car up a steep ramp at a few miles per hour - best to drop into first gear (move the Johnson bar forward) and give it a bit more gas (open the throttle) but without over-revving (keep the steam chest pressure slightly below the boiler pressure).
When you go faster, the way you use the throttle and reverser is different. It's different depending on whether you're trying to accelerate, slow down or simply cruise, and whether you're doing that going uphill, downhill or on level track, and it also depends a lot on the speed (as well as the load). I found that it helps a lot to read up on how steam locomotives work, not just superficially but at the level of thermal and fluid dynamics, and about what happens during each stroke of the piston, from steam coming in, pushing directly on the pistons, followed by the steam expanding and applying pressure that way, to when it is pushed out of the exhaust on the return stroke. It's from reading many such books and technical articles that I understand why the cut-off and valve gear timing is so important and why you don't necessarily go faster by pushing the reverser further forward. At certain speeds and throttle settings, it actually slows you down, just like changing down a gear in a car when you're going fast - it induces engine braking (or even engine breaking if you're really ham-fisted with it!). I actually saw a post on RSC's facebook from someone complaining that a steam loco sometimes slowed down when he put the reverser further forward, and implying that it must be a huge error in the code! Anyway, what all of this has shown me is that, despite what some people say, the steam simulation in RW4/TS2013 is actually very good and if the simulation data is done with care, it is possible to make the models run very realistically.