In article
,
(Mr Thant) wrote:

Demolishing the enormous brick viaduct over the Great Eastern Main
Line on the east side of Brick Lane. It's in the way of the ELL's
own
bridge over the line. Apparently it weighs 12,000 tonnes:

http://www.tfl.gov.uk/corporate/medi...ntre/6798.aspx

Mostly brickwork, though. "Demolition of the current bridge means
removing some 12,000 tonnes of brickwork."

That'll mainly be in the surrounding Bishopsgate Goods approach viaducts.

--
Colin Rosenstiel