Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 136,320 pages of information and 219,072 images on early companies, their products and the people who designed and built them.
The original bridge carried the Liverpool and Manchester Railway over Water Street.
It was the first cast iron bridge constructed to carry a main line railway (as distinct from a tramway). It took the railway into the terminus station, now the home of Manchester's Museum of Science and Industry.
The bridge was subsequently replaced by a steel girder bridge in 1904 (see photo).
More information and illustrations here.