Origin
The motivation for the conversion was firstly that, as a one-off, locomotive 61 002 could not really be used for scheduled services, and secondly that the research institute at VES-M Halle urgently needed locomotives that could do at least 160 km/h in order to test passenger coaches.
For the conversion a DR Class 22 new-design boiler, parts of the unsuccessful high pressure locomotive, H 45 024, (outside cylinders, trailing wheels and rear section of the locomotive frame) as well as the tender of locomotive 44 468 were used. The inside cylinder of the three-cylinder engine was not however taken from 61 002, rather a new one was made. Other technical improvements were a Riggenbach counterpressure brake and a Giesl ejector. The locomotive was streamlined at the front and over the boiler fittings.
The new locomotive was given its number to commemorate the first German locomotive with a 4-6-2 ('Pacific') wheel arrangement, the Baden IV f of the Baden State Railways (later the DRG Class 18.2).
In 1967 number 18 201 was converted to oil-firing. After the changeover to computerised numbers the engine was given the number 02 0201-0. On 11 October 1972 during a trial run it attained a top speed of 182,4 km/h. As a result it is the fastest, operational steam locomotive in the world, and also holds the world record for the biggest driving wheels (2.30 m in diameter) ever to be fitted to an engine with a 4-6-2 wheel arrangement.
When not required for test runs, locomotive 18 201 was also put in charge of scheduled express trains until well into the 1970s.
Read more about this topic: DR 18 201
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