Knowing that a great many RMWeb members are devotees of the work of Rev Peter Denny, I am promoting this topic from being a minor diversion in my main thread to become a separate topic.   It originated in the fact that my two hobbies, railways and cycling, often coincide, because many of my bike rides take me into the area in which Rev Denny set his ever-evolving model railway, The Buckingham Branches, which is rich with real, let alone imagined, railway history. To be honest, so steep