| Route | Heathrow Airport Link Line |
| Section | Heathrow Tunnel Jn to Heathrow Airport Terminal 4 |
| Remarks | British Airports Authority (BAA) owned |
| Maps | HLL1 • Google • Airport Jn , Heathrow Airport |
| Details | Track Curvature • Elevation Profile • Geology |
| Extent | 19.857km to 26.860km • 4.351 miles • 7.002 km |
| Units | ℹ️ Kilometre-based ELR |
| Measured | 6.868 km (-135m, relative to reported extent) ⚠️ |
| Grouping | HLL , HLL1 , HLL2 |
| Neighbours | HLL , HLL2 |
| NR Region | 🟧 Wales & Western |
| LOR | 🟠 GW180 Heathrow Airport Jn to Heathrow Terminals 4 and 5 |
| TRACKmaps | 🟠 Western & Wales |
Additional Information
Administrative Area
| Mileage | Country | Administrative Area |
|---|---|---|
| 19.857km to 26.860km | England | Hillingdon |
Nearest Place and District
| Mileage | Nearest Place | District / County | Distance |
|---|---|---|---|
| 19.857km to 20.247km | West Drayton | Greater London - Hillingdon | 1119m - 1187m |
| 20.248km to 22.379km | Sipson | Greater London - Hillingdon | 358m - 1153m |
| 22.380km to 23.184km | Harlington | Greater London - Hillingdon | 1169m - 1814m |
| 23.185km to 23.707km | Sipson | Greater London - Hillingdon | 1831m - 2077m |
| 23.708km to 26.181km | West Bedfont | Surrey - Spelthorne | 644m - 2069m |
| 26.182km to 26.860km | East Bedfont | Greater London - Hounslow | 1069m - 1265m |
Positional Accuracy Statistics
| Property | Count | Min | Max | Mean | Median | Std Dev |
|---|---|---|---|---|---|---|
| Linear Accuracy | 17 | -101m | 7m | -8m | -0m | 25m |
| Normalised Quarter Miles | 17 | 291y | 446y | 422y | 440y | 49y |
| Calibration Segment Length | 17 | 56y | 547y | 450y | 547y | 188y |