Public performance measure (PPM) shows the proportion of trains that arrive at final destination on time. On time is defined as within five minutes, or within ten minutes for the long distance train operators. For existing TOCs, disaggregated PPM data at the sub operator level are available on the Data Portal.
Significantly late refers to trains that arrive at final destination between 30 and 119 minutes late.
Cancelled trains refers to both full and part cancellations. A full cancellation is when the train failed to run entirely or ran less than 50 per cent of booked mileage. Trains that arrive over 119 minutes late are counted as full cancellations. A part cancellation is when the train terminated short of destination or started beyond origin. Trains that fail to call/stop at a booked station are counted as part cancellations.
A complaint is defined as ‘any expression of dissatisfaction by a customer or potential customer about service delivery or about company or industry policy’.
As some TOCs carry more passengers than others, we have presented the data as a rate per 100,000 passenger journeys. This is a superior measure to a ratio against passenger kilometres as, no matter how long the trip, a dissatisfied customer will only complain once.