Two tables this month. This is because the reliability data is based on four-week railway accounting Periods, while Modern Railways is published monthly. As a result, we get to the situation where Periods are running ahead of the monthly cycle and it is time to reset.
This year, it also provides the opportunity to update the criteria for the table and purge some entries.
Originally, the criterion for promotion from TIN-watch was a Miles per Technical Incident Moving Annual Average (MTIN MAA) of 50,000. While Hitachi and Siemens have both managed to achieve this, as time passed it became clear I had been hopelessly optimistic in my expectations for this second wave of post-privatisation rolling stock orders.
When fleets from the first wave were winning Golden Spanners with well over 50,000 MTIN MAA, for their successors, with the benefit of over a decade of technical development, to achieve that after a couple of years of running-in did not seem unreasonable.