The Chiltern main line from Marylebone and Paddington into the Vale of Aylesbury was in some respects overshadowed by the proximity of the rival routes of the Great Western Railway and London and North Western Railway from London. Marylebone later also taking on a more obvious role as the London terminus of the independent Great Central Railway. Nevertheless, the Chiltern line and its various offshoots had a rich legacy of railway interest in the age of steam. Drawing on images from The Transport Treasury collection, the traveller is taken on a journey north from Gerrards Cross, through High Wycombe to Princes Risborough while detouring <i>en</i><i> route</i> to take in the branches to Maidenhead, Marlow, Aylesbury, Watlington and as far as Thame on the line to Oxford.