Raising Steam is the 40th Discworld novel, written by Terry Pratchett. It features the introduction of locomotives to the Discworld and an entirely new character but it also stars Moist von Lipwig. Dick Simnel, a young self-taught engineer from Sto Lat, has invented a steam locomotive named Iron Girder. He brings his invention to Ankh-Morpork where it catches the interest of Sir Harry King, a millionaire businessman who has made his fortune in the waste and sanitation industry. Harry promises Dick sufficient investment to make the railway a success.