I noticed this yesterday too on the Ormskirk line, still displaying "Liverpool Central" despite terminating at Walton. One even left Ormskirk with "Not in service" on it.Engineering work on the Northern Line Today meant that the Southport to Hunts Cross services could only run as far as Hall Road, however I noticed the PIS on the 777's were still showing "Hunts Cross". Is it not possible for them to show the correct Terminating station "Hall Road"? I'm sure their predecessors Class 507/508 fleet were capable of doing this.
Seems disappointing they appear to have no flexibility outside of their "route".