LNER Class A4
The Class A4 is a class of streamlined 4-6-2 steam locomotive designed by Nigel Gresley for the London and North Eastern Railway in 1935. Their streamlined design gave them high-speed capability as well as making them instantly recognisable, and one of the class, 4468 "Mallard", holds the world record as the fastest steam locomotive. Thirty-five of the class were built to haul express passenger trains on the East Coast Main Line route from London Kings Cross via York to Newcastle, and later via Newcastle to Edinburgh, Scotland. They remained in service on the East Coast Main Line until the early 1960s when they were replaced by Deltic diesel locomotives. Several A4s saw out their remaining days until 1966 in Scotland, particularly on the Aberdeen - Glasgow express trains, for which they were used to improve the timing from 3.5 to 3 hours.
Steam locomotive
For a short period after the war, both Bundesbahn (DB) and Reichsbahn (DR) still placed orders for new steam locomotives. They needed to renew the rolling stock, mostly with steam locomotives designed for accelerated passenger trains. Many of the existing predecessors of those types of steam locomotives in Germany had been lost in the battles or simply reached the end of their lifetime, such as the famous Prussian P 8. There was no need for new freight train engines, however, because thousands of the Classes 50 and 52 had been built during the Second World War.
Because the concept of the so-called "Einheitslokomotiven", the standard locomotives built in the 1920s and 1930s, and still in wide use, was already outdated in the pre-war era, a whole new design for the new steam locomotives was developed by DB and DR, called "Neubaudampflokomotiven" (new-build steam locomotives). The steam locomotives made by the DB in West Germany, under the guidance of Friedrich Witte, represented the latest evolution in steam locomotive construction including fully welded frames, high-performance boilers and roller bearings on all moving parts. Although these new DB classes (10, 23, 65, 66 and 82) were said to be among the finest and best-performing German steam locomotives ever built, none of them exceeded 25 years in service. The last one, 23 105 (still preserved), went into service in 1959.