Nigel Gresley
Sir Herbert Nigel Gresley (19 June 1876 – 5 April 1941) was an English railway engineer. He was one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer (CME) of the London and North Eastern Railway (LNER). He was the designer of some of the most famous steam locomotives in Britain, including the LNER Class A1 and LNER Class A4 4-6-2 Pacific engines. An A1 Pacific, "Flying Scotsman", was the first steam locomotive officially recorded over 100 mph in passenger service, and an A4, number 4468 "Mallard", still holds the record for being the fastest steam locomotive in the world (126 mph).
Mallet locomotive
Mallet designs were popular in Hungary, too. 30 of (B'B) were built between 1898–1902 (the last one served until 1958). was a (1B)B locomotive in service between 1905–1969 and (C'C) until 1962. The strongest Mallet-locomotive of the Hungarian State Railways was MÁV 601, a (1'C)C type steam locomotive. With 2200 kW power, MÁV 601 was the most powerful steam locomotive built before and during the First World War in Europe.