To change the timetable would include altering all the trains that connect/would get in the way of/would need to overtake said train, as well as re-timing a load of freight that would use the line around that time to fit around the timetable change which is ran by another operator, and then that freights times would need altering when it reaches another main line/ their services on the other main line would need altering to accommodate the new times the freight would reach their line say the WCML via the NLL where there may be no available slot for it... huge can of worms opened, just by truing to re-timetable one service... worth it? nope.
My lack of knowledge obviously shows here
In response to SprinterMan, we never had Class 317 trains operating the 07:40. Only for 2 weeks max replacing the 07:40 whilst the 321 disappeared for repair works before Christmas. We had a 12-car 321 as always for the 07:40 service. Is it that other services that used the 317 have now gained an 8-car 321 from 4-car 321s taken off busier 12-car services?
