Ruben PhilipsenMy dear wife Loes walking underneath a railroad bridge, Passage du Sablon, Metz, France, 2019.<br>
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Railroad bridges are usually made of either stone, concrete, steel or timber. Nearly all of the North American, South American and Asian railroad bridges were built of either steel or timber. In Europe, Russia and parts of China, timber was almost never used but concrete and stone were quite prevalent. The simple arch bridge not only is the most beautiful and spectacular of all railroad bridge types but it is also the most perfect form for handling the heavy load of a train since the materials in the bridge are always in compression. Arches are shaped into some form of either a semicircle or a segmental. If the arch is made of steel, hinges are often located at the two springing points to relieve temperature related expansion and contraction stresses.<br>
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