Starting the Worcester - Didcot at Oxford is a bit of a joke. Does that mean it's OK for the statistics?
No, a common misconception. From the
ORR» website:
A train is classed as a full cancellation if it ran less than half of its planned journey length.
A train is classed as a part cancellation if:
• It ran at least half but not all of its planned journeys length, or
• It completed its whole journey length but failed to stop at one or more of its planned stations.
That's the basis of ORR's statistics, but
DfT» also receives operational monitoring data (more of it than ORR), in which cancellation is subtly different. (Some of ORR's stats - CaSL and
PPM‡ - are passed to DfT and used as well.) In part that's because of its use - monitoring performance under the contract. DfT are also sent the Train Plan, which is compared with the Service Level required. Cancellations are deviations from the Enforced Train Plan, and judged against the excuse for them (as also are short-forms). As definitions, cancellations are full or partial, and each sort can be Disputed or Network Rail (which must include other
TOCs▸ and
FOCs▸ via
NR» ). Numbers are given for each.
“Cancellation” means a Passenger Service:
(a) which is included in the Enforcement Plan of the Day and which is cancelled and attributed to the Franchisee pursuant to its Track Access Agreement; or
(b) which is included in the Enforcement Plan of the Day and which operates less than 50 per cent. of its scheduled mileage (as prescribed in the Enforcement Plan of the Day) for reasons attributed to the Franchisee pursuant to its Track Access Agreement;
“Partial Cancellation” means a Passenger Service which is included in the Enforcement Plan of the Day and which Passenger Service:
(a) misses a stop;
(b) completes 50 per cent. or more, but less than 100 per cent. of its scheduled journey as prescribed in the Enforcement Plan of the Day; or
(c) arrives at its final destination scheduled in the Enforcement Plan of the Day more than 120 minutes late,
in each case, for reasons which are attributed to the Franchisee pursuant to its Track Access Agreement;
So mostly, the words have got lawyerised. The Enforced Train Plan is defined circularly: the general long-term operating plan that best meets the timetable, and is used by DfT for enforcement (insofar as they do any).