On Apr 22, 11:08*pm, "Clive D. W. Feather" wrote:
Am I mad or just totally confused? There are two arches to the bridge
carrying West End Road, the main one with the UP and DOWN lines, and the
other one empty. Why an arch if no siding?

If you go towww.old-maps.co.uk, you can look at maps from a range of
dates. The 1935, 1960, 1962, and 1968 maps all fail to show anything
south of the running line, though there's a suggestive amount of empty
space. Even going back to 1914 shows nothing there.

All probably part of the Met's plans to eventually quadruple the line
when it eventually reached High Wycombe.