On Oct 8, 9:35 pm, (Colin Rosenstiel) wrote:
It's two parallel double track viaducts though, isn't it? With space for
station platforms as islands on each viaduct?

According to Pendar's photos
(http://www.loveplums.co.uk/Tube/Broa...t_line_1.html), it appears
to be a four-track viaduct with the island being in between the track
pairings.