By the 1840s, there were a number of proposals to build railways in the region, and the River Don Navigation Company acted to ensure they would remain in business. An attempted takeover of the Barnsley Canal in 1845 was not concluded, but gave them some bargaining power while it appeared likely. They bought out the Dearne and Dove Canal in 1846, and acquired the Sheffield Canal from the Manchester, Sheffield and Lincolnshire Railway in 1848, which, as the Sheffield and Lincolnshire Junction Railway, a predecessor and constituent company, had bought it in 1846. After protracted negotiations, they absorbed the Stainforth and Keadby Canal in 1849. They then amalgamated with the South Yorkshire, Doncaster and Goole Railway in 1850, to become the South Yorkshire Railway and River Dun Company. This in turn was leased to the Manchester, Sheffield and Lincolnshire Railway for 999 years in 1864. By the 1880s, there was dissatisfaction among the users that the rates for traffic were higher than on the railways, and the canals were failing to modernise, as steam boats were banned, despite them having been in use for 50 years on the neighbouring Aire and Calder Navigation.