Yep, I know that one very well, I ballasted a joint that had never been completed about a week before Dagworth’s first show. As per all my large layouts the signalling is fully interlocked with track circuits. When we got to the show the constant occupancy of that circuit meant I was unable to change points at one end of the station. I can’t remember exactly how I solved it but it involved bypassing that particular track circuit until it dried fully.
Andi