Engineer's Line References (ELRs)


Last update 2 September 2023

Additional information is always gratefully received, whether entirely new records (particularly historical records) or information to fill in gaps or correct errors, via the contact link under the Miscellaneous entry in the navigation bar above. Thank you.

Mileages are given in the form miles.chains unless stated otherwise. 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

  11.04		Heathrow Airport Junction with MLN1
  11.15		later down main line Heathrow Airport Junction with MLN1
  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 formerly H. T. 1-2-3 or H. Central T. 1, 2 & 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 of Central and including terminal 1, sometimes together.

Note too that this route became HLL and HLL1 once the Terminal 5 branch opened