The Luton town to Orpington line is 41 miles long but if you add the Sevenoaks branch it’s 49miles long. Operators: Thameslink. This would be set when there were class 319’s Locos: Class 700 Class 319 These services have limited services from Orpington to Luton Town. But they normally go to Kentish Town. Trains from Sevenoaks go to Blackfriars. Depots: Cricklewood TMD More pics Class 700 at Blackfriars Class 319 at West Hampstead Thameslink Class 700 at St Pancras international