Gloster
Established Member
Aren’t all distances on the underground measured from a zero point at the buffer stops at Ongar. The transfer from the Central to the sub-surface lines takes place at Mile End, which means that for Mile End-Upminster the distances are counting down.As here - from Watford to Ricky starts at Watford at km 76.08, km descending to Croxley 74.10 and Watford E Jn 73.26. Where the kmage changes to 72.80, and increases to Watford N Jn 73.35 (matching kmage up the 'main line' from Baker St and Watford S Jn), Ricky 74.52 and on.
Remember these km figures are arbitrary progessive distances along the line, not really measured from anywhere in particular.