Photo of the Calcutta (Kolkata) Docks taken in 1885 by an unknown photographer. The Calcutta Port is the only major riverine port in India and constitutes the Calcutta Dock System. Dock number one shown here, was the outer dock and was primarily intended for vessels bringing imports and loading export cargoes. The temporary railway lines were established for the easy removal of 'spoil', or waste earth accumulated during the excavation of the site.Source: bl.uk