Thanks for the reply. I'd like to say it does but after running the scenario some more times, both driving and watching (have I mentioned how useful that is?), I must still be missing something obvious. Each time I come down the line the AWS horn sounds, the distant signal is at caution, and the stop signal is at danger. So I stop. But if I enable Show target speed while I'm sat there it shows 34mph... and if I'm watching the AI driver they reduce speed to ~34mph and sail right through. So my question this time is: how can one tell when one can pass a signal at danger? Is it something to do with it being a junction signal (assuming it is one)?
BTW would you prefer I post any future questions in the trainsim.com Diesel Railcar Simulator thread? My questions seem mainly academic rather than DRS specific and others there can probably correct any further misunderstandings I have.
P.S. I've just bought the game - the copy I got was won from RPS - after all the game's great and I've been bugging you with my questions :-)