About 225,000 of these passengers pass through the Canarsie Tunnel, a two-tube cast iron rail tunnel built below ... a temporary floating pontoon bridge across the East River.

Each pillar is made of cast iron, weighing 8-10 tonne ... The eight iron piers span 9-10 metres across the four rail lines. The rail bridge on the north-south spans a length of around 50-60 ...

In November 1777, Abraham Darby III began designing and erecting 378 tons of cast iron, to build a bridge in the Shropshire gorge, on the banks of the River Severn. The bridge was completed in ...