“Cancelled due to a short-notice change to the timetable.”
This is a new explanation for cancelled trains, used both in passenger announcements on stations and in online information such as Journeycheck.
It’s not just TPE who are using this excuse. All the train operating companies are using it, which indicates that it’s not an initiative by TPE and its use is down to a decision either by the Department for Transport or the Rail Delivery Group.
If it sounds meaningless, then it probably is. All they are saying is
“it’s cancelled because it’s cancelled.”
Fortunately we can translate.
“It’s cancelled because of staff shortages.”