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| Brockley Hill Station (unbuilt) Remnants of the viaduct that was partially built to carry the tracks at the un-built Brockley Hill station on the abandoned Northern Heights extension of the London Underground's Northern Line from Edgware to Bushey Heath. Work on the viaduct started in the late 1930s but progress was stopped by the start of WWII. After the war the extension was cancelled and most of the viaduct was demolished leaving just these brick piers. Category: station northern heights unbuilt
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