Thameside route: Minor infrastructure works and additional rolling stock to allow all main line peak-service trains to be extended progressively to 12-car formation; the extension of platforms on the Tilbury loop and Ockendon branch to handle 12 cars, to allow all main line peak-service trains to be extended progressively to 8 or 12-car formation.
West Anglia route: The extension of remaining non-compliant platforms on the Liverpool Street-Cambridge route and at Stansted Airport to handle 12 cars; the reinstatement of 9-car trains in the peaks on the Hertford East, Enfield Town, Cheshunt via Southbury and Chingford branch services, requiring a small amount of infrastructure; a shuttle service between Cheshunt and Seven Sisters, where a power-operated turnback would be provided, and where interchange with London Underground is available, should be introduced during the peaks; stabling and maintenance facilities for the larger, enhanced fleet; removal of the three level crossings between Tottenham Hale and Waltham Cross; power supply to be enhanced for some of these options and likely future requirements.
Greater Anglia perspective Doubling of Haughley Junction (on the Cambridge-Stowmarket route), full commissioning of Ely West Curve, and accommodating Class 6 freight trains, all to improve performance.
Great Eastern route Continued lengthening of (mainly shoulder) peak trains to 12-car formation; additional stabling facilities.
[9] In March 2009 Network Rail published its CP4 Delivery Plan 2009, including Enhancements programme: statement of scope, outputs and milestones,[10] confirming several of the recommended interventions.