The world speed record for steam locomotives was held by a 4-6-4 at least twice. In 1934, the Milwaukee Road's class F6 no. 6402 reached and, in 1936, the German class 05.002 reached . That record was broken by the British 4-6-2 no. 4468 Mallard on 3 July 1938, when it reached , still the world speed record for steam traction.
