Part of the reason to add staging tracks is to get away from using the same train for a morning and afternoon runs. My trains 33 and 34 where the afternoon potato train became # 73 and 74. These are now a fast freight of any kind. It could be piggy backs, a tank train or whatever. That was easy enough.
Then there was the other Canadian trains. Since this train went into St. Albans, which was full. I had to go through the new staging tracks.. CN3/4 now becomes 87 and 88 the more realistic milk train. Southbound will pick up full express reefers and make some passenger stops. Northbound will set out empties at the dairies and make some passenger stops.
The evening passenger trains 12/13 will not work dairies and becomes a more express train stopping at just the bigger cities.
The morning passenger service no longer works dairies and becomes more of a commuter train.
With these changes comes the inevitable schedule changes. These are a headache no matter how you do it. Change one thing and it affects everything else. Then once you are happy you actually run the schedule and you must make more changes.