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TECHNOLOGY READINESS LEVELS (TRLs)

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Technology Readiness Level

ESA Description

Railway Equivalent Description

(Source: Network Rail http://www.networkrail.co.uk/Guide/product-acceptance/TRL-for-railways.pdf)

TRL 1

Basic principles observed and reported

Product technology has basic principles observed and reported

TRL 2

Technology concept and/or application formulated

Product technology concept and/or application formulated

TRL 3

Analytical and experimental critical function and/or characteristic proof-of-concept

Product technology has a proof-of-concept model built

TRL 4

Component and/or breadboard functional verification in laboratory environment

Prototype Product's validation testing completed in the Lab environment

TRL 5

Component and/or breadboard critical function verification in relevant environment

Prototype Product's validation testing completed in the rail relevant environment

TRL 6

Model demonstrating the critical functions of the element in a relevant environment

Prototype Product's validation testing completed as a part of a wider system in rail relevant environment

TRL 7

Model demonstrating the element performance for the operational environment

Prototype Product's validation testing completed as a part of a wider system on national rail infrastructure

TRL 8

Actual system completed and accepted for flight ("flight qualified")

Actual Product ready for integration into a wider system on national rail infrastructure

TRL 9

Actual system "flight proven" through successful mission operations

Actual Product is successfully integrated and tested as a part of wider system on national rail infrastructure