After the success of the corrugated furnace, Fox turned his attention to other products, and in 1887 exhibited in Newcastle his flanged frame plate for railway rolling stock. Traditional rolling stock was built of timber frames with a timber superstructure, producing a heavy vehicle that required considerable tractive effort from the locomotive. Pressed steel rolling stock was made from relatively lightweight flanged steel, giving it comparable strength to timber but considerable savings in dead weight. The construction technique, which used male and female dies in a hydraulic press, was very labor savings in comparison to hand-built timber cars. Fox found an ally in the promotion of his pressed steel vehicles in E R Calthrop, who promoted pressed steel rolling stock for his system of narrow gauge railways, and used them on the Barsi Light Railway.
The United States showed much more interested in pressed steel cars so in 1889 the Fox Solid Pressed Steel company was established in Joliet, Illinois, 40 miles (64 km) south-west of Chicago. Clem Hackney, who had previously worked for the Union Pacific Railroad, was made general manager. By 1893 the works employed 400 men producing 80 tramcars and freight cars per day. A larger plant was built in Pittsburgh in 1896. In 1899 Fox sold his American operation to rival Charles T. Schoen, who went on to form the Pressed Steel Car Company. The company stayed in business until it was purchased in 1923 by Cammell Laird, which closed the Armley works in 1929.
Leeds Forge successfully sued R.H.Clayton & Sons Ltd over patent infringement for an improved boiler flue. In 1924 the Leeds Forge Company built 50 electric carriages for the New South Wales Government Railways, Australia. The bodies were shipped to Sydney in knocked-down form and assembled at Eveleigh Railway Workshops and Clyde Engineering. They were the first all-steel carriages in Australia. In 1922 they supplied new all steel sleeping cars for the blue trains operating from Calais to French Riviera.
