double-tee girder

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Metrorail (Miami) — Metrorail A southbound train entering Tri Rail station. Info … Wikipedia
building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… … Universalium
Rail profile — Rail from 1896 Cross sections of flat bottomed which can rest directly … Wikipedia
Rail tracks — are used on railways (or railroads), which, together with railroad switches (or points), guide trains without the need for steering. Tracks consist of two parallel steel rails, which are laid upon sleepers (or cross ties) that are embedded in… … Wikipedia
Three-drum boilers — Three drum boiler, casing removed … Wikipedia

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