I'm currently working on a switching scenario for the Horseshoe Curve route in which I decided to give the new AI pick-up function a try. What I wanted to do was to have some AI work going on in the background while the player did its own switching in the foreground. Unfortunately, the route designer placed end-to-end track markers on nearly all the yard sidings and AI pickups cannot take place under those circumstances. That is, I can create the instructions, but the AI engine just sits tight "scratching its head", obviously not being able to figure out the instructions.
I intend to keep trying, but I really wish that route creators would place a single, short marker on each yard track for the purpose of naming it, thus allowing scenario writers to place additional markers for specific actions. The only other solution would be allowing track markers to overlap each other, which is not currently possible.
Tom Pallen