Question to the Department for Transport:

To ask the Secretary of State for Transport, what criteria are used to establish whether delays over five minutes to a scheduled commuter train service in (a) London and (b) the South East were caused by (i) Network Rail, (ii) the train operating company or (iii) other factors; and what changes have been made to those criteria since January 2008.

The criteria for establishing delay causes are to be found in the Delay Attribution Guide, issued by the Delay Attribution Board – a joint industry body remitted to provide guidance to the industry on delay attribution issues.

The current guide was issued in April 2014. Copies of the all the guides since 2007 can be seen at:

http://www.delayattributionboard.co.uk/delayattributionguides.htm