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London North Western
Railway:
 Midland
Railway:
 Stratford
Midland Junction Railway
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LMS Route: Rugby to Wolverhampton LMS Route: Rugby to
Leamington LMS Route: Rugby to Tamworth LMS Route: Rugby to
Leicester LMS Route: Rugby to Market Harborough
Rugby Locomotive Testing Station: lnwrrm2645
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British Railways Standard Class 9F 2-10-0 No 92013, the
first of the class to be tested, is seen going through its paces sometime
during the period May to August 1954. The Standard Class 9F design was
introduced to meet the need for considerably more powerful heavy freight
locomotives than any of those designed by the former Railway Companies. It was
intended that they should be capable either of hauling heavier trains or of
maintaining higher average speeds than could the older regional types. This
Bulletin was concerned with the performance of the design as it emerged, except
for a few minor modifications and also formed the basis for the allocation of
locomotives of the class to the duties for which they were best suited and to
enable those duties to be performed within the most economical range of the
locomotive in so far as the Operating Department's requirements were satisfied.
It did not cover any of the later variations from the original design. The test
results were also presented as a record of the performance of the design of
what was expected to be the last class of steam locomotive to be built for the
railways of Great Britain. (It certainly was). The presentation of the data in
this Bulletin was divided into two main parts.
The first defined the relationship between coal as fired,
water as drawn from the tender, tractive effort and horsepower both as
available at the drawbar, data directly applicable to the immediate commercial
purpose of examining train loadings and schedules to obtain reduction in fuel
consumption by working the locomotives where possible nearest their point of
maximum operating efficiency. The second part was concerned mainly with thermal
efficiency, giving data on a basis of indicated power, covering boiler and
cylinder efficiencies, factors of more importance in locomotive design. . The
tests were planned and carried out partly by the Locomotive Testing Station at
Rugby and partly by the Locomotive Testing Section of the Chief Mechanical and
Electrical Engineer's Department of the London Midland Region using the Mobile
Test Plant and this bulletin was prepared jointly by the staff at Rugby and
Derby. The work was conducted on behalf of' the Locomotive Testing Joint
Sub-Committee. The boiler and cylinder performances were first established by
tests on the Stationary Testing Plant. These tests were followed by tests on
the line using the Mobile Testing Plant. On these the boiler efficiencies which
had been established on the Stationary Plant were reproduced and the
corresponding coal and steam rates were related to the work at the drawbar. Two
Standard Class 9F locomotives were fully tested, both at Rugby and on the line,
and a third underwent a limited series of tests on the Stationary Plant. The
data presented was that which was regarded as typical of the class.
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