Editing BR Standard Class 5 (section)

== Background ==
[[William Stanier]]'s [[LMS Stanier Class 5 4-6-0|Black Five]] had been the most successful mixed-traffic type in Great Britain. Construction of the Black Fives had started in 1934 and continued past nationalisation to 1951. A new set of 'standard' locomotives was to be built by British Railways, based on LMS designs and incorporating modern ideas.

In particular, the Standard design incorporated features designed to make disposal of the engine after a working "turn" easier: a self-cleaning smokebox and a rocking grate removed the necessity for crews to undertake dirty and strenuous duties at the end of a long shift.<ref>{{cite book |first=Terry |last=Essery |title=Steam Locomotives compared |date=August 1996 |publisher=Atlantic Transport Publishers |isbn=0-906899-65-6}}</ref> This was a necessary investment with the ever-increasing costs of labour following the [[World War II|Second World War]].

The original design proposal for the class 5 locomotive had a {{whyte|4-6-2}} wheel arrangement,<ref>*{{cite journal|journal=Journal of the Institution of Locomotive Engineers|year=1951|volume=41|pages=273–404|doi=10.1243/JILE_PROC_1951_041_036_02|title=British Standard Locomotives |first1=E. S.|last1=Cox|issue=221 }}</ref> similar in concept to the [[SR West Country and Battle of Britain classes|Bulleid Light Pacifics]] that performed impressively during the [[1948 Locomotive Exchange Trials|1948 Locomotive Exchanges]]. However this was deemed unnecessarily large and costly for a class 5 power requirement, so the successful LMS Class 5 {{whyte|4-6-0}} design was used as the basis instead. The pacific design went on to be enlarged and used for the [[BR Standard Class 6]].