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Mileages are given in the form miles.chains. Figures prefixed with ≈ are approximate, those in parentheses are not on this route but are given for reference. Reference to 'start'/'end' of an asset are as read down the page.
GUA Grendon Underwood to Ashendon Junction
159.10 Grendon Underwood Junction with MCJ3
161.57 AKEMAN STREET
161.61 later end of line
164.75 Ashendon Junction with NAJ3 (0.27) [down line]
165.21 Ashendon Junction with NAJ2 (33.55) [up line]