Are Chiltern still using class 68 Diagrams on the Marylebone-Birmingham route.Ive seen Diagrams that state a 68 works the 13.10 Marylebone- Birmingham, however on Realtime trains this service is for a 158 sprinter.
ISTR hearing that the ARS (automatic route setting; the thing that helps signallers when everything's running smoothly by automatically setting routes) in Marylebone IECC is configured to only route things that are timed as Class 158s, hence the reason why everything on the Chiltern lines is thus timed.