[CB] Southbound Closures [ECMLS 9/9]

#ts14 Scenario Final GB #rtdp{00000029-0000-0000-0000-000000002014} East Coast Main Line London-Peterborough Powerhaul Class 66 V2.0 electric First Capital Connect Class 321 #scnr{feca609b-6e37-451a-8cf1-0237be504275}