A group of Urban Explorers have managed to get inside what some people consider the holy grail of subterranean London – the Mail Rail. This is the mini-underground railway that used to take letters along tracks to different station/sorting offices located deep beneath London streets.
The Mail Rail stretches from Paddington to Whitechapel and is still more or less intact, despite having been mothballed nearly a decade ago in 2002. Silent UK managed to gain access and then explored the full length from the track, investigating and photographing nine stations along six miles of track.
Read the lot here – it’s an extraordinary story.
You can watch a film about Mail Rail here.
The Great Wen 
I was once promised a trip on the Mail Rail while it was still running, but for one reason or another it never happened. One of the great lost opportunities of my life…