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| Route | Heathrow Airport Link Line |
| Section | Heathrow Tunnel Jn to Heathrow Airport Terminal 5 |
| Remarks | British Airports Authority (BAA) owned |
| Maps | Interactive: HLL2 • Minimaps: Airport Jn , Heathrow Airport |
| Urban Areas | Hillingdon |
| ELR Extent | 19.861km to 26.307km • 4.006 miles • 6.447 km |
| Units | ⓘ Kilometre-based ELR |
| Track ID Extents | ☐ 19.861km to 19.897km • 0.023 miles • 0.037 km |
| ☒ 19.897km to 26.182km • 3.905 miles • 6.285 km |
| ☐ 26.182km to 26.307km • 0.078 miles • 0.125 km |
| Grouping | HLL , HLL1 , HLL2 |
| Neighbours | HLL , HLL1 |
| NR Region | 🟧 Wales & Western |
| TRACKmaps | 🟠 Western & Wales |
| LOR | 🟠 GW180 Heathrow Airport Jn to Heathrow Terminals 4 and 5 |
| From | To | Nearest Place | District / County | Proximity |
|---|
| 19 ●●● | 20 | West Drayton | Greater London - Hillingdon | Remote |
| 20 | 22 ● | Sipson | Greater London - Hillingdon | Near → Remote |
| 22 ● | 23 | Harlington | Greater London - Hillingdon | Remote |
| 23 | 23 ●● | Sipson | Greater London - Hillingdon | Remote |
| 23 ●● | 24 | West Bedfont | Surrey - Spelthorne | Remote |
| 24 | 25 | Stanwell | Surrey - Spelthorne | Remote |
| 25 | 26 ● | Longford | Greater London - Hillingdon | Remote |
| From | To | Country | Administrative Area |
|---|
| 19 ●●● | 26 | England | Hillingdon |
| 26 | 26 ● | England | Surrey |