[HS]-Choppers on Patrol (Class 20)

diesel #ts14 Scenario Final GB Southampton-Salisbury Extension Western Lines of Scotland Thompson Class B1 Fowler 4F Stanier 8F BR Robinson Class 04 #rtdp{00000075-0000-0000-0000-000000002017} BR Class 20 #scnr{5ec4a40d-5da0-432b-b12d-0c323c63f7bf}