[CB] Northbound Closures [ECMLS 8/9]

#ts14 Scenario Final GB #rtdp{00000029-0000-0000-0000-000000002014} East Coast Main Line London-Peterborough electric First Capital Connect Class 321 #scnr{61e281d6-b282-4e9b-b72c-39e1dc3d0562}