Historically the Great Central Railway, whose longer distance services did not continue as long as the longer distance services of other railways. Most remaining points served are within commuting distance from London.
MAIN LINE: Marylebone-Princes Risborough
2 tracks Marylebone-Princes Risborough
Aylesbury (from Princes Risborough/1 track)
Harrow Line operates via London Underground Metropolitan Line from Harrow-on-the-Hill to Amersham. From Harrow-on-the-Hill to Moor Park, 4 tracks. From south to north, pairs of tracks identified as Fast, Local.
All lines 2 tracks unless noted. All lines diesel operated.
Number Of Platforms/Tracks: 6
Platforms numbered east to west
Platform 1-6 - Main Line
Wikipedia link containing further station information and history.
Zoomable Google Maps along the various lines.