Can you tell me exactly what point (perhaps with a mention of the next destination and the miles remaining) that it runs out of water?
I'm driving it right now and I've just gone on 35 miles without a problem while using the auto fireman, with a number of full injector cycles from 0.70 to 0.90 done successfully. The main thing is to keep your steam production down to below 70,000 so that you're turning water into steam at a slower rate than your injecting water into the boiler, hence allowing the water level to build up rather than dropping further.
A bit of a sneaky exploit I found out (having plenty of time to try it out on what is a quite boring scenario) is that pushing the regulator up and the reverser down gets you better performance and economy, because the F7s behind you follow your regulator percentage only. I was cruising on 76% regulator (notch 6 for a diesel) and 29% reverser (true value on the HUD) for most of the 35 miles I drove.
I have a hunch that the real problem is actually a core coding problem to do with controls rather than a content issue. I found that I lost keyboard control of the reverser right at the start and had to use the mouse control on the HUD. My theory is that the new TS2012 simulation of multiple powered vehicles in a consist is being confused by a steam/diesel combination, and that you might be getting stuck on 100% reverser.
Based on this theory, I believe that if I clone the scenario and edit it so the diesels are dead in consist (like a UK railtour would run with it/them just providing electrical supply) or removed completely the loss of reverser control will no longer be an issue. Unless somebody else tries this first I'll do it late tonight, but a warm and sunny summer day and tickets to the Australia vs India one day cricket rank as a much higher priority between now and then
