This plan got as far as receiving the approval of Parliament but did not proceed. Other schemes were mooted and in 1871, six different schemes were under consideration. Finally the Severn Bridge Railway's scheme was approved by Parliament and received Royal Assent on 18 July 1872. The Severn Railway Bridge was built by the Severn Bridge Railway Company to transport coal from the Forest of Dean on the Severn and Wye Railway. At the time it was expected that the amount of coal freighted would increase year by year and the existence of a bridge would remove the necessity for the coal to be shipped via Gloucester. Work began in 1875 and was completed in 1879; the wrought iron bridge, which was long and above high water, had twenty-two spans and had stone abutments made from local limestone. The first span across the Gloucester and Sharpness Canal, which ran parallel to the Severn at this point, operated as a swing bridge. The twenty-one fixed spans, in order of erection from the southeast (Sharpness) side, consisted of thirteen of length , five of length , two of length , and a single span of length . The bridge incorporated of iron. It was approached from the south-east by a two-arch masonry viaduct on the canal embankment leading to the swing bridge, and on the northwest by a 12-arch viaduct about high. The river, with its large tidal range (the Severn bore) and strong currents, made construction difficult. The pier columns were formed of cylindrical sections, about in diameter. Near the west bank, the bedrock was a long way below the shifting sands so much work had to prepare firm foundations. Staging was used through which the sections were lowered by chains, and when in place, filled with concrete. Near the east bank, a primitive piling machine was used to drive the sections through a ridge of clay. The staging was extended upwards for use while assembling the spans. The spans were assembled on site. Staging was laid and rails put in place to carry a travelling crane. The long beams were hoisted in place first, followed by the vertical bracings, and then the outer and inner plates of the top chordal trusses and the diagonals. The whole structure was bolted together at first, and later riveted by blacksmiths using hand-operated forges. Some individual spans were completed within a week, with contractors being complimented on the efficiency of their work. The main contractor was Hamilston's Windsor Ironworks Company Limited of Garston, Liverpool.