Bathtub curves calculated

Hitachi’s Class 385 is a model of reliability growth

You will note that this month’s New Train TIN-watch table has gained an extra column. This is entirely due to reader Graham Heald, who wrote in pointing out that this feature would be more useful if it included trends and even more so if I could show some reliability bathtub curves for new trains.

With Miles per Technical Incident (MTIN), more is better, with improvement giving an upward line on the graph. To get a bathtub curve you need a reliability metric where less is more. This can be achieved by replacing ‘Miles per TIN’ with ‘TINs per mile’.

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