In article ,
Martin Underwood writes
Can I ask a supplementary question? Whereabouts in London (or even in the
whole of Britain) is the closest pair of level crossings in terms of the
length of road (not railway) between them? I'm talking about separate
crossings with separate sets of barriers.

Not London, but at Queen Adelaide, north of Ely, there are *three*
crossings in quick succession on the B1382, as the line splits into
three (the Ely Loop doesn't have one, unfortunately, or there'd be four
in a row). The sequence is about 500m in total, with the western pair
much closer than the eastern pair.

There's a level crossing (Helpston) right where the
Peterborough-Leicester line diverges from the ECML. I can't recall
whether it has one set of barriers or two, though.

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