Historical version 5 of Heathrow Terminal 4 Station (view current version)
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(streetmap)
(osm)
(gmap)
(bingmap)
(streetview)
Zone 6 Tube station on the Piccadilly Line.
Actually inside Heathrow Airport. There's a bus station here too, and (after 27th March 2008) the Heathrow Connect service also terminates here.
OS X co-ord:
507978
OS Y co-ord:
174538
(Latitude:
51.459019
Longitude:
-0.445608)