07 099 DGN Certificate of Derogation from a Railway Group Standard (PDF), su rgsonline.co.uk, Rail Safety and Standards Board, 24 agosto 2007, p. 2. URL consultato il 13 febbraio 2012 (archiviato dall'url originale il 2 ottobre 2013).
«The new CTRL St Pancras terminal station and approaches is fitted with colour light signalling. In addition, the continuous supervision KVB Automatic Train Protection (ATP) system is installed to comply with CTRL requirements for full ATP.»