Recently Chiltern Railways were found to be one of the licences DTG have access to, at least according to that leak. While I think a lot of people would prefer a route up the Chiltern Mainline to High Wycombe I think the route to Aylesbury via Amersham is more likely, for a couple of reasons. It's about the right length at 39 miles, and it would feel like a more complete route than if they were to cut the Mainline short at say High Wycombe. Firstly, the Class 165/0s are the primary form of traction on this route. As the 166 is already in the game a lot of the work is already done. It wouldn't be exactly the same though. They have very different interiors and as they are only capable of 75mph they'd probably have to tweak the physics a bit. They have a slightly different front as well. I imagine it would be a similar amount of work as it was to bring the 387 to BML. Secondly, a significant chunk of this route runs alongside, and even shares track with the London Underground's Metropolitan line. If DTG decide to make the Metropolitan line in the future (the survey showed people would like to see another Underground route), then a significant chunk of the track would already be done. Plus, they'd be able to add the Chiltern 165s as AI trains as a layer (and vice versa with S stock trains as a layer on the Aylesbury line). What do you think?