The main suspension chains are carried across the centre span in the form of horizontal ties resting on the high-level footway girders.
If a footway is added about o 4 ton per ft.
The bridges in order above London Bridge are as follows, railway-bridges being bracketed - Southwark, (Cannon Street), (Blackfriars), Blackfriars, Waterloo, (Hungerford - with a footway), Westminster, Lambeth, Vauxhall, (Grosvenor), Victoria, Albert, Battersea, (Battersea), Wandsworth, (Putney), Putney and Hammersmith.
The girders weighing 2000 tons carry a double track for trains between the girders and on each side on cantilevers a trolley track, roadway and footway.
The river is crossed by St John's Bridge of nine arches, completed in 1772 from the designs of John Smeaton and widened a century later; by Victoria Bridge, a modern structure connecting South Street with Dundee Road; and farther south (at the end of Tay Street) by a footway alongside of the viaduct belonging to the Caledonian railway.