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How is MTIN calculated?

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samuelmorris

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Had a quick search but I haven't really found anything on this that really explains it to me in a manner I understand.

Is the current benchmark (e.g. the golden spanner) miles, or minutes between incident? Furthermore, how is it calculated?
e.g. if the best fleet in its class has a rating of 25,000 miles, does that mean that each unit averages 25,000 miles before a failure, or is that the 'worst case' unit of the fleet? I'd imagine it's fairly common for fairly fast units to cover 500-800 miles a day.
If every unit in a fleet like that failed on average 25,000 miles then you'd have a failure every day with a fleet size of only 30. Is that right?

Sorry if this is blindingly obvious!:)
 
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yorkie

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What's MTIN? do you mean miles per casualty (MPC)?

Informed Sources, January 2005

Roger Ford said:
To maintain continuity, the latest figures are for Period 7 of the current year. The basic measure is miles per casualty (MPC), with a ‘ casualty' defined as a technical or maintenance defect on a train causing a delay of 5 or more minutes.
 

millemille

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An MTIN is a service affecting incident that causes a delay to the service of 3 minutes or greater or causes a cancellation (it's not quite that simple but the exact details aren't really relevant).

Rolling stock reliability is currently measured in Miles Per Casualty (MPC) where a Casualty equals a 5 minute delay or cancellation, for each 28 day performance period, but the industry is moving to the 3 minute criteria so this will become MPM.

Meaningful rolling stock performance is measured on MAA MPC. The Moving Annual Average of the MPC figure, so the average of the previous 13 period's MPC figures. This evens out perfectly normal statistical blips and gives a more measured, less reactive, measure of how each fleet performs.
 

sprinterguy

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The latest annual Modern Railways "Golden Spanner" awards (December 2012) used the MTIN (Miles per Technical Incident Number) value to measure fleet reliability.

Therefore to answer the OP's original query, the MTIN figure is miles between an incident causing a delay to the service of 3 minutes or greater, or a cancellation, as millemille explains, and is an average value for any train within a particular fleet.
 
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87015

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The latest annual Modern Railways "Golden Spanner" awards (December 2012) used the MTIN (Miles per Technical Incident Number) value to measure fleet reliability.

Therefore to answer the OP's original query, the MTIN figure is miles between an incident causing a delay to the service of 3 minutes or greater, or a cancellation, as millemille explains, and is an average value for any train within a particular fleet.
Between accepted technical incidents, as a delay won't be counted if it is still in dispute at the end of the period as it is "not proven". Unfortunately it just means many TOCs fleet teams simply put off accepting incidents by placing them into dispute until period end - often once period end has passed so figures have been collated, all the outstanding delays are then accepted as they don't affect the MTIN then...
 

samuelmorris

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The latest annual Modern Railways "Golden Spanner" awards (December 2012) used the MTIN (Miles per Technical Incident Number) value to measure fleet reliability.

Therefore to answer the OP's original query, the MTIN figure is miles between an incident causing a delay to the service of 3 minutes or greater, or a cancellation, as millemille explains, and is an average value for any train within a particular fleet.

Ok thanks so if the standard figure for a fleet of 40 units is 20,000 miles per technical incident, then if the average distance covered by each unit is 500 miles a day, you can statistically expect a 'technical incident' once a day?
 
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