Thank you for the replies and I have been watching videos on interrupts, and I am impressed and amazed. Also relearning circuit logic and examples. I'm going to try interrupts.

i have started playing after several missed updates and have discovered the various grouping lists. So i made a group for all my Iron stations, both loader and unloader ones. I am running into the issue that the trains are just going from top to bottom of the list. I can't remember if I need to use ...