As its October that means it the start of the leaf fall season and RHTTs run to bust the age old leaves on the line problem. To start us off 66019 with 66001 on the rear form the 3J05 Amersham to London Marylebone at Neasden South Junction. These two along with 66017 are the only three members that can work this as they are fitted with LUL tripcocks for the part beyond Harrow. Won't be long before the locos get covered in dirt.