doesn't it mask the fact that the TOC▸ in question does not have sufficient trains to offer resilience in covering the advertised timetable?
ToC's well in reality the
DfT» will have sufficient rolling stock to operate the timetable with capacity to allow for maintenance and a % of failures. It would be un reasonable to have 100% spare just in case! The travelling public just would not want to bare the cost of excessive over capacity.
There will be times when a fleet has a major issue that for safety reason or as in the case of
SWR» contamination stock is taken out of use. Most of the things that take rolling stock out of use on a large scale would also impact on the spare stock