The introduction of chained scenarios makes it much easier to develop what would have been long scenarios as easily-digestible lumps and I really must give them a whirl but I found that TS didn't like long scenarios anyway. I tried to develop an early-morning fitted freight train for S&Cv7, starting at Hellifield. There was a short stop at Settle then a long grind up the Drag before waiting at Blea Moor for an express to pass. All that was fine but I started to see odd things after that. AI trains would start to appear showing red lamps to the front and then AI trains would set off in a very odd fashion - apparently staying put after their launch time but then vanishing and reappearing some way down the line where they should have been had all gone according to plan. Things became even more erratic after that and the scenario had to be abandoned because, as has already been said, it lasted three hours in total and as the 'errors' didn't appear until after the hour mark the testing just got out of hand.
Keith