I would like to suggest a pair of new routes which both use the same basis but set in different eras. Firstly, as a extension of GWE, the Marlow Donkey route from Maidenhead to Bourne End and the switchback to Marlow set during the same period as the GWE route and using class 165/166 Turbos with possibilities to use older stock. Secondly, the same route, but set in 1969/70 when trains (first gen dmus) went beyond Bourne End to call at Wooburn Green and Loudwater, terminating at High Wycombe on the current Chiltern line. Bourne End switchback in recent times Route diagram Bourne End looking beyond current terminus towards High Wycombe Wooburn Green with DMU Loudwater with DMU
