the building the Great Northern Viaduct was built parallel to the Cornbrook Viaduct over the basin, and over the Kenworthy Warehouse. The country's longest Victorian commercial terrace was built to mask it from Deansgate. Textile warehouses in the Italianate palazzo style were built in other parts of Manchester city centre, notably King Street in the 1840s spreading to Portland Street, Charlotte Street and by the start of the 20th century, Whitworth Street. In all covering over a square mile of the city centre, Manchester was called Warehouse City and arguably was the finest example of Victorian commercialism. Bridges of Castlefield The canal basin at Castlefield is crossed by four large railway viaducts dating from 1848, 1877 and 1898. The southern viaduct in the group of three is the 1849 red brick viaduct of the Manchester, South Junction and Altrincham Railway with its cast iron arch bridge over the Rochdale Canal. It carried the double tracks between Manchester Piccadilly via Oxford Road station and Knott Mill railway station, then turns south-west, crosses the canal basin and heads for Altrincham. Designated as No.100A, it forms part of the long brick viaduct taking the Altrincham branch of the Manchester South Junction & Altrincham Railway through Knott Mill Station. The bridge, designed by William Baker, spans 31.9m. It has six cast iron ribs each made in five pieces and bolted together. The ribs are braced with cruciform cast iron sections. The twin railway tracks were carried on cast iron deck plates. The resident engineer was Henry Hemberow, and the sections were cast by Garforths of Dukinfield. The MSJ&A Railway was Manchester's first suburban railway line. A second cast iron rib arch bridge by Baker passed over Egerton Street but this was reconstructed in steel in 1976. The central one in the group of three southwest of Deansgate Station is the high-level iron truss girder viaduct of 1877 built for the Cheshire Lines Committee by the Midland Railway. It's known as Cornbrook Viaduct. The viaduct is a red brick and wrought iron truss girder construction. When it opened in 1877, it carried trains coming from a temporary station to Irlam and Warrington, and Chorlton via a branch line. The temporary station was replaced by Sir John Fowler's Manchester Central Station in 1880, which operated until 1969 and is now used as an exhibition centre (Manchester Central). To the north is the 1894 Great Northern viaduct