Various means of pre-heating the water supplied to the boiler were tried over the 125 years of steam locomotive development. In 1854 Joseph Beattie of the London & South Western Railway introduced a steam heated water supply system on his new locomotives and in 1862, Stephenson & Co. built a locomotive with a tank under the footplate which was used to heat the feed water using live steam. Sometimes, tender water heating was used. The introduction of injectors provided some pre-heating of feed water in themselves but they would not work if the water had already been heated to above 120 F in the tender or before reaching the injector. In later years some locomotives used feed water heating and had to have steam driven feed pumps. The French ACFI system was a well-known example.