Maidenhead Railway Bridge, over River Thames

 brug, spoor(weg)brug

Partial extract of Wikipedia re this very famous and amazing Brunel bridge, still so after nearly 170 years:

The bridge was designed by the Great Western's famous engineer, Isambard Kingdom Brunel, and it was completed in 1838. The railway is carried across the river on two brick arches, which at the time of building were the widest and flattest in the world. Each span is 128 feet (39 m), with a rise of only 24 feet (7 m). The Thames towpath passes under the right-hand arch (facing upstream), which is also known as the Sounding Arch, because of its spectacular echo.

It has been claimed that the board of the Great Western Railway did not believe that the arches would stay up under the weight of the trains and ordered Brunel to leave the wooden formwork used to contruct the arches in place. However, Brunel simply lowered the formwork slightly so that it had no structural effect, but appeared to be in place. Later, when the formwork was washed away in floods, but the bridge remained, the strength of the arches was accepted