Ok this isn’t one of my usual radical ideas, but anyway, I’ve noticed that the Donny to Lincoln service is a fairly random 5tpd service. This seems to use 1 unit, taking 45 minutes. Could this not be a 1tp2h service, with a fixed path at each end every 2 hours and c15 min turnarounds? 1 unit still. More efficient, attractive service (except for extra use of diesel). Seems simpler for the controllers, the passengers and the overall railway. Thoughts?