Here is a nice little piece which has been put on youtube, filmed at the bottom end of Coppermill Lane. The bridge carries the railway from Clapton to Tottenham Hale. The road leads onto Walthamstow Marshes and over to Springfield Marina, the River Lea and Springfield Park, but don't bother trying to take a car - its a dead end to four wheeled traffic. Surprisingly, I have never bumped my head on the bridge, even when on my way back from the Anchor and Hope in the dark.