Prior to publishing the first All Lines Timetable in 1974, British Rail produced individual timetable books for each Region.
On some longer-distance inter-regional routes such as Manchester to Yorkshire, the published timetables were split at a boundary location deemed convenient to the railway rather than passengers, and often this was not a terminus or particularly large station. Only the train's major origins or destinations were shown in "foreign territory" beyond this.
The LMR public timetables for Manchester/Leeds via Calder Valley had their boundary point with the ER at Sowerby Bridge.
For Shrewsbury/Llanelli via HOW trains, the LMR timetable's boundary was Craven Arms.