Named after their inventors, two of the earliest design patents were for the Bollman and Fink truss. Starting in the 1840s, early railroad builders began to use a variety of wrought iron truss forms that were introduced and patented by their designers as the best and most economical way to safely carry the “iron horse” across gaps in the terrain. The Milwaukee Road rolls across Montana's Clark Fork River on a two span Pratt deck truss at Cyr Bridge To become acquainted with these truss types, I recommend downloading the HAER (Historic American Engineering Record) page above.
#Steel arch bridge tallest series#
The basis concept behind all truss bridges is a distribution of the weight across a series of steel triangulated members that are either in compression or tension. Of the numerous types of large bridges found on railroads around the world, the most common form is probably the simple truss. A Treatise on Wooden Trestle Bridges, 3rd Edition (~80MB).Tyrrell - History of Bridge Engineering (~150MB).Tyrrell’s History of Bridge Engineering and for timber bridges, Wolcott Foster’s A Treatise on Wooden Trestle Bridges. Just below, you can also download three great turn of the century bridge books that have a lot of railway bridge information: J.A.L. For a more clear and concise understanding of these types of railroad bridges, I highly recommend purchasing the inexpensive and easy to obtain Bridge & Trestle Handbook by Paul Mallery. The descriptions below will give you a brief explanation of the most common bridge types. In Europe and China, timber was almost never used but concrete and stone were quite prevalent. Nearly all of the high North American railroad bridges shown within this web site were built of either steel or timber. In North America, stone and concrete arches were rarely used for very high railroad bridge construction due to the difficulty of having to build tall centerings which are large, temporary timber supports curved in the shape of the stone or concrete arch that will be built upon it. Railroad bridges are usually made of either stone, concrete, steel or timber.
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