Half a century of locomotive development
article by: Ian Crowder
The appearance on Monday 18th of October 2004 of both Great
Western 2-8-0T* no. 4247 (at that time a resident on the GWR) and
9F 2-10-0* no. 92203 Black Prince demonstrated half a
century of freight locomotive development.
The occasion was the re-dedication of David Shepherd's
locomotive, 'Black Prince', at Toddington. No 4247 is essentially a
tank locomotive version of the first-ever eight-coupled* heavy
freight design in the UK.
First 2-8-0 in the UK
That pioneer, locomotive no. 97, was completed in 1903 at
Swindon works and was an immediate success. The prototype was later
renumbered 2800 and the first production run of 20 locomotives were
completed between 1905 and 1907 (an example of this first batch is
no. 2807, which is currently being overhauled at Toddington by
Cotswold Steam Preservation Ltd and is expected to steam in late
2009 or early 2010).
These locomotives were the most powerful of their day and so
trouble-free were they that, with only relatively minor changes,
continued in production on and off until the mid-1940's.
It quickly became clear, however, that there was also a need for
very powerful tank locomotives capable of handling heavy mineral
trains, particularly in South Wales, over relatively short
distances. A 2-8-0 tank locomotive was designed and the prototype,
No 4201, appeared in 1910. This was the first and only 2-8-0 tank
locomotive class ever to run in the UK. It shared many features
with the larger 2800 class including thinner flanges on the middle
pairs of driving wheels and spherical joints on the coupling rods
to allow maximum flexibility when negotiating curves. With various
improvements, this design continued to be built until 1940. No 4247
was completed in 1916.
It is a testament to sound Great Western design and engineering
expertise that many of both the 2800 and 4200 classes survived to
the end of steam.
A new but short-lived era for steam
In 1948, the railways were nationalised and British Railways set
about designing a number of modern, standard classes of steam
locomotive. The objective was both to replace many ageing classes
that were well past their best and introduce standardisation to
simplify maintenance and allow interchangeability of parts - a
highly successful concept pioneered by the Great Western
Railway.
The last British Railways design, and the most powerful freight
locomotive produced in the UK, was the 9F class 2-10-0. It was
introduced in 1954 and boasted the highest tractive effort of any
UK steam locomotive design. It benefited from larger driving wheels
than previous heavy freight designs and this meant the locomotives
were capable of handling heavy trains at high speed.
The class also found themselves handling passenger trains,
particularly over the steeply-graded Somerset and Dorset line
between Bournemouth and Bath. Indeed, one member of the class is
credited with achieving a speed of 90 mph when deputising for a
failed locomotive on the east coast main line.
The 9Fs were very successful and well liked by footplate crews.
They were both free-running and economical and capable of some
prodigious performances. Production was shared between Crewe and
Swindon. David Shepherd's 9F, no 92203, was among the last to be
built, emerging from Swindon works in 1959. Just a few months
later, sister locomotive no. 92220 'Evening Star' became the very
last member of the class and the very last steam locomotive to be
built for main line use in Great Britain.
Already, the 'modernisation plan' was under way and diesel and
electric traction was even then beginning to displace steam in some
parts of the country. In all, 251 9F's were built and could be
found throughout the UK. Most saw much less than ten years' service
before being withdrawn and scrapped - long before their useful life
was over.
It is highly appropriate that Swindon works - which pioneered
modern heavy freight locomotive design with no 97 and then the tank
version, no 4200 - should build the very last of a long line of
powerful steam locomotives to keep Britain's industries moving.
Quickly steam declined and, in 1968, it was all over. David
Shepherd bought no. 92203 straight out of British Railways service
and he immediately named it 'Black Prince'. By then, locomotives
such as 4247, 2807 and 3822 were already quietly rusting away at a
scrapyard in South Wales.
* A reference to the wheel arrangement. Locomotives are
described in general terms by the number of leading wheels, driving
wheels and trailing wheels they have. '2-8-0' indicates that the
locomotive has two leading or 'pony' wheels, eight driving or
'coupled' wheels and no trailing wheels. 'T' after a wheel
arrangement description (such as 2-8-0T) indicates a tank
locomotive (it doesn't have a tender). Locomotives are sometimes
described as 'eight-coupled' or 'ten-coupled' design - in other
words, they have eight or ten driving wheels.