The Itinerary

 Here is the grand plan:

To make sense of it, the start of each day is numbered
e.g. day 2 from Home to London Bridge, Cambridge, Kings Cross, York and Newcastle.

Two of the ToC's IDs may need clarification, GR is LNER (London North Eastern Railway) and VT is Avanti West Coast which used to be Virgin Trains.

There are 8 there-and-back day trips, most were added to extend the 6-day tour to this 14-day tour. However, day-3's NCL to LIV return is the longest journey on TransPennine so will serve to evaluate TP's offering.