Tower bHill/b station for platform lengthening and the on-going redevelopment of Delta Junction to enable three-carriage trains to operate on the network. London Overground. Responsibility for the old Silverlink franchise of the North b....../b M53 bBidston/b Moss viaduct. 40 23 January 2009. HA. Managing agent contractor Area 9. 275 23 February 2009. HA. Managing agent contractor Area 12. 202 6 March 2009. Notes: 1 Same cut-off values apply as for Table E1: for DfT(C) and HA ...