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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.
HLL Heathrow Link Line
HLL Network Rail portion
11.04 Heathrow Airport Junction with MLN1
11.15 Heathrow Airport Junction with MLN1 [later position of down main line junction]
12.25 HEATHROW INTERCHANGE
12.30/19.908km Heathrow tunnel portal end-on junction with HLL1 and ownership boundary (NR/BAA)
Note that this was part of the original HLL