That would make sense, as I suspect the through service to Scotland wasn't particularly frequent? Also it appears not all of them called at Ormskirk.
Does anyone have access to a copy of the old timetables?
Winter 1963/64 timetable through services, weekdays:
06:00 Liverpool Exchange to Preston (TC to Blackpool Central) arriving 06:56, callling at Sandhills, Ormskirk, Burcourgh Jn, Rufford, Croston, Lostock Hall, Todd Lane Jn
08:36 Liverpool Exchange to Preston (TC to Blackpool North and Fleetwood) arriving 09:31, callling at Sandhills, Ormskirk, Burcourgh Jn, Rufford, Croston, Lostock Hall, Todd Lane Jn
09:50 Liverpool Exchange to Preston SO arriving 10:38, callling at Aintree Sefton Arms, Ormskirk, Burcourgh Jn (also SX arriving 10:36 from 20th April 1964)
11:05 Liverpool Exchange to Preston (TC to Blackpool Central) arriving 12:01, callling at Aintree Sefton Arms, Ormskirk, Burcourgh Jn, Rufford, Croston, Lostock Hall, Todd Lane Jn
12:35 Liverpool Exchange to Preston (TC to Blackpool Central) arriving 13:34, callling at Aintree Sefton Arms, Ormskirk, Burcourgh Jn, Rufford, Croston, Lostock Hall, Todd Lane Jn
13:10 Liverpool Exchange to Preston SO (TC to Blackpool Central ) arriving 14:02, callling at Maghull, Ormskirk, Burcourgh Jn, Rufford, Croston, Lostock Hall, Todd Lane Jn
15:15 Liverpool Exchange to Preston SX arriving 12:01, callling at Ormskirk, Burcourgh Jn, Todd Lane Jn
16:03 Liverpool Exchange to Preston arriving 17:00, callling at Aintree Sefton Arms, Ormskirk, Burcourgh Jn, Rufford, Croston, Lostock Hall, Todd Lane Jn
16:35 Liverpool Exchange to Preston (TC to Glasgow Central (+RC) and Edinburgh Princes St) arriving 17:14, no intermediate stops
16:40 Liverpool Exchange to Preston SX (TC to Blackpool Central and Skipton) arriving 17:23, calling at Burscough Jn
17:00 Liverpool Exchange to Preston (TC to Fleetwood and Windermere (SX) ) arriving 17:49, callling at Aintree Sefton Arms (pick up), Ormskirk, Burcourgh Jn, Croston
17:45 Liverpool Exchange to Preston (TC to Millom and Bootle (SO) ) arriving 18:31, callling at Ormskirk, Burcourgh Jn
19:40 Liverpool Exchange to Preston arriving 17:49, callling at Aintree Sefton Arms (SO), Ormskirk, Burcourgh Jn
21:00 Liverpool Exchange to Preston (TC to Blackpool Central ) arriving 17:49, callling at Ormskirk, Burcourgh Jn
There are seventeen through services in the other direction which call at Ormskirk, as well as six from and eight toward Liverpool on a Sunday. Post if you want the details of those services.