Last update 1 March 2021
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.
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 ownership boundary (NR/BAA) and measurement unit change 19.908km/12.30 Heathrow tunnel portal 23.550km/14.51 HEATHROW TERMINALS 2 AND 3 23.667km/14.56 up line junction with Terminal 5 route 24.301km/15.08 down line junction with Terminal 5 route 26.520km/16.38 HEATHROW TERMINAL 4 Note that, apart from the temporary Heathrow Interchange station, all stations include the term(Rail Station Only)on the National Rail Enquiries system. Heathrow Terminals 2 and 3 has been known by various names including use ofCentraland including terminal 1, sometimes together. Note too that this route became HLL and HLL1 once the Terminal 5 branch opened