Written Question·Department for Transport·UIN 121180

Network Rail: Assets

Tabled: 16 March 2026

Answered: 30 March 2026

Question

Alex Mayer

To ask the Secretary of State for Transport, pursuant to the Answer of 14 January 2026 to Question 102105 on Network Rail: Assets, what assessment she has made of the effectiveness of Network Rail’s calculation of the Composite Sustainability index for ea

Answer

Keir Mather

The methodology for the composite sustainability index (CSI) calculations is developed by Network Rail and is recognised by the regulator, the Office of Rail and Road, as being a reliable and effective means to monitor the changing remaining life of railw...

ⓘ

This is an extract from the Parliament API. Search the full answer on Parliament.uk (UIN 121180) →