The Trent company had four prosperous decades until the arrival of the railways led to toll reductions. By the 1880s the navigation was in a bad way. It was clear what improvements were needed in order to compete successfully: larger locks, a deeper dredged channel, and steam-powered boats. The necessary Acts were passed; despite money being difficult to raise, much work was done. Nottingham Corporation made major investments and took over the river between the city and Newark in 1927. After nationalisation in 1948 more work was done, culminating in the enlargement of Cromwell and Newark Locks.