Abstract: A method and system for the removal and replacement of bridges, for example, steel single-span railway bridges, starts with erecting vertical columns on the existing piers or abutments of the bridge. Cross-beam means are secured to the columns, perpendicular to the length of the bridge. A plurality of jack assemblies are positioned on each cross-beam means, the jacks each acting on a high-strength rod secured to the section of the bridge to be removed. The bridge section is cut away, lifted by the jack assemblies, and then the lifted bridge section is shifted sidewise on the cross-beam means to position it over a parallel track on the intact section of the bridge. The jacks then lower the removed bridge section onto a removal means, such as a railroad car, on the intact section of the bridge. The new section of bridge is then delivered and placed in position in a similar manner.