LSWR 415 class

Infobox Locomotive
powertype=Steam
name = LSWR/SR 415 class

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caption = Preserved 488 on the Bluebell Railway
designer = William Adams
builder = Robert Stephenson & Co. (28); Dübs & Co. (20); Neilson & Co. (11); Beyer Peacock (12)
serialnumber = RS 2501–2518, 2601–2610 Dübs 2000–2009, 2105–2114; Neilson 3200–3210; BP 2167–2178
builddate = 1882–1885
totalproduction = 71
whytetype = 4-4-2
gauge = RailGauge|ussg|lk=on
leadingsize = convert|3|ft|1|in|m|3|abbr=on
driversize = convert|5|ft|7|in|m|3|abbr=on
length = convert|36|ft|5.5|in|m|2|abbr=on
weight = 55 tons 2 cwt (55.9 tonnes)
fueltype = Coal
fuelc

waterc

cylindercount = Two, outside
cylindersize = 17½ × 24 in (445×610 mm)
boilerpressure = convert|160|psi|MPa|abbr=on|lk=on
tractiveeffort = convert|14919|lbf|kN|abbr=on|lk=on
railroad=London and South Western Railway, Southern Railway (Great Britain), Southern Region of British Railways
locale=Great Britain
nicknames = "Radial Tank"
railroadclass=BR: 1P
retiredate=1916–1961
preservedunits = No. 488
disposition = One preserved, remainder scrapped

The LSWR 415 class is a steam tank locomotive of 4-4-2T wheel arrangement, with the trailing wheels forming the basis of its "Radial Tank" monicker. It was designed by William Adams and introduced in 1882 for service on the London and South Western Railway (LSWR).

Originally rostered for suburban traffic, the class was soon displaced to the countryside by Dugald Drummond's M7 class. Most of the class was scrapped around the end of the First World War, and further decreases meant that all of them were due to be withdrawn by 1929. However, the class was noted for its long service on the Lyme Regis branch line, and three members of this long obsolete class were utilised on this duty until 1962, when suitable replacements became available. One has survived and can be found on the Bluebell Railway.

Background

This locomotive, designed by William Adams, was the result of the work made to replace the stop-gap 46 Class on suburban services around London. In the event, they were also intended to supplement this class while members entered the works for rebuilding into "Radial Tank" configuration.Burtt, F.: "L. & S.W.R. locomotives: 1872–1923" (London: Ian Allan, 1949)] All were built from 1882, and were also intended for medium to heavy suburban passenger traffic around the South Coast on the LSWR railway network.

Construction history

William Adams' 415 (later 0415) Class was based on his earlier LSWR 46 Class, and was specifically designed with London suburban services in mind.Harvnb|Herring|2000|pp=44–45.] The design was based on a 4-4-0 design with a trailing axle added to support an enlarged coal bunker, a necessity for the intensive suburban services of the LSWR network.Bradley, D.L.: "LSWR Locomotives: The Adams Classes" (Didcot: Wild Swan Publications, 1985)] The radial axlebox worked in a corresponding curved hornblock the centre of which was struck near the middle of the chassis. The device was originally invented in 1863 by William Bridges Adams (no relation)Harvnb|Ahrons|1927|p=160,] and could be applied to a leading or trailing axle but was generally preferred for the latter. Many other engineers used it, including Webb, R. J. Billinton, H. G. Ivatt, and D.E. Marsh. Many of the tank engines so fitted earned the soubriquet "Radial Tanks", or simply "Radials".The enlarged coal bunker was also designed to incorporate a back tank for extra water storage in addition to the capacity of the side tanks. Valve gear was of modified Stephenson type.

Production began in 1882 when a total of four engineering companies were contracted by the LSWR to construct the new class, which numbered 71 when production ceased in 1885. These were: Robert Stephenson & Co. (28 constructed); Dübs & Co. (20 constructed); Neilson & Co. (11 constructed) and finally Beyer, Peacock and Company (12 constructed). This arrangement was because Nine Elms, the LSWR's own locomotive works, was already stretched to capacity in terms of production.

Although all were constructed to the same basic design, the locomotives that were outshopped from 1884 had slightly larger side water tanks and deeper fireboxes, therefore increasing efficiency. All carried the trademark Adams stove pipe chimney throughout his tenure as Locomotive Superintendent of the LSWR.In order to facilitate the speedy overhaul of these locomotives in the confined spaces of Nine Elms, spare boilers were constructed. Coupled to a short wheelbase and guiding bogies, the locomotive was relatively manoeuvrable on tight curves, a feature that was to ensure the survival of some of the class later on.

Upon the appointment of Dugald Drummond as Superintendent of the LSWR after Adams' departure, the class was modified slightly, with the application of his lipped chimney in place of the stovepipe version that the locomotives were equipped with when built.This also coincided with the addition of coal rails to the bunker in an attempt to increase capacity. Because the class was not considered to have a long working life under Robert Urie, they were not equipped with superheating.

Operational details and preservation

Despite being well received in service by locomotive crews, the 0415's tenure on the London suburban services was relatively short-lived. This was especially true with the introduction of the Adams T1 class of 0-4-4 tanks displacing some of the class from the London area.However, it was not until the introduction of Drummond's M7 class 0-4-4 tanks and electrification of the suburban railway network that the class was generally removed from the London section of the LSWR to rural branch duties from 1895.

Despite this, in 1903 the inextricable link was made between the class and the severely curved Lyme Regis branch. Unsuccessful trials were carried out with the Stroudley Terriers and the Adams O2 class; however with the trailing axle modified H.C Casserly: "The London & South Western Locomotives" (London, Ian Allan enlarged edition 1971)] the flexible 0415 class tanks proved to be highly suited to the operating conditions of that line. As a result, two were allocated to Exmouth Junction shed for the Axminster to Lyme Regis service, joined in 1946 by a third example retrieved from the East Kent Railway following closure.

War service and Colonel Holman F. Stephens

The class also saw service during the First World War, which effectively extended their working lives until 38 were withdrawn in 1921. Many of the class became surplus to requirements during the later years of the war, and in 1917 number 0488 was sold to the Ministry of Munitions. Several of the class were utilised in Scotland where the Highland Railway was experiencing a locomotive shortage.

Locomotive number 0488 was sold by the Ministry of Munitions to Colonel Holman F. Stephens, between 1919 and 1921, for use on the East Kent Railway. Restored to LSWR condition and renumbered 5, it worked this stretch of line for several years.

outhern Railway ownership

These decreases in the class strength meant that only 30 locomotives entered into Southern Railway stock in 1923. The continued electrification and subsequent intensification of timetables meant that the remaining two members of the class still in service, numbers 0125 and 0520, were retired in 1929.The intent was to replace the class with two ex-LB&SCR D1 class tanks, though these proved highly unsatisfactory, leading to the decision to re-commission and rebuild numbers 0125 and 0520 at Eastleigh, where they were outshopped as 3125 and 3520.

In 1946 the Southern Railway required a third 'Radial' tank for the Lyme Regis branch to cover locomotive unavailability, and found 0488 (number 5) out of use, but intact, on the East Kent Railway. It was subsequently purchased and sent to Eastleigh Works for overhaul, where it received its updated number, 3488.

Operation during nationalisation and preservation

These three locomotives continued on the Lyme Regis branch after Nationalisation due to the lack of better motive power to cope with the curve restrictions in place on the line. By 1958 all three locomotives were showing their age, and the end finally came in 1961. Modifications were undertaken on the trackwork to enable Ivatt 2-6-2 tanks to be passed for use on the line. This resulted in numbers 30582 and 30584 being scrapped. Steam on this branch was short-lived after the demise of the 0415 class, replaced by diesel railcars. The branch was closed under the Beeching cuts in 1964.

However the final example, 30583 (488), was purchased by the Bluebell Railway, and after arriving at the line under its own steam performed sterling work in various guises as a BR, SR and LSWR locomotive until 1990. At present it is displayed as a static exhibit as extensive overhaul is required before it can steam again.

Livery and numbering

LSWR and Southern Railway

Initially outshopped in early LSWR passenger Yellow Ochre/Brown livery with the initials 'LSW' on the water tank sides. This was eventually superseded by the later LSWR Passenger Sage Green livery, with black edging and black and white lining. Numbering was in gilt, as was the 'LSWR' lettering on the water tank side.

Numbering under the LSWR depended on batch, which therefore led to a confusing system of numbers that were granted to locomotives as they were outshopped.Bradley, D.L.: "LSWR Locomotives: The Adams Classes"(Didcot: Wild Swan Publications, 1985)] Beyer-Peacock constructed the first batch, which was allocated the series 415–432. Stephenson constructed several batches including the series 45–57, 68, 82, 77 and 78, with the final examples being 104, 106, 107, 125, 126 and 129. Dubs produced numbers 169–173, 490–495 and finally 516–525. Neilson produced the batch 479–489.

A duplicate number was granted to class members between 1903 and 1924, so that after grouping in 1923, the Southern Railway inherited locomotives with a '0' prefix to the LSWR numbers. The final three class members that survived the mass withdrawal of 1929 were renumbered 3488, 3125 and 3520 after overhaul.

Livery under the Southern was Richard Maunsell's darker version of the LSWR Sage Green livery, with yellow numbering and lettering on the water tank sides and coal bunker. This livery also featured black and white lining.

Post-1948 (nationalisation)

The class was given the Power Classification of 1P, and initially carried the Southern livery, though this was promptly changed to the BR Standard Mixed-Traffic Black livery with red and white lining. Longworth, Hugh: "British Railway Steam Locomotives: 1948–1968" (Oxford Publishing Company: Oxford, 2005) ISBN 0860935930] Numbering was of the BR standard system, the three locomotives being allocated the numbers 30582, 30583 and 30584.

References

Notes

Bibliography

*citation |last=Ahrons |first=E. L. |title=The British Steam Railway Locomotive 1825 to 1925 |date=1927 |location=London |publisher=Locomotive Publishing Co
*citation |last=Herring |Peter |title=Classic British Steam Locomotives |date=2000 |publisher=Abbeydale Press |location=London |isbn=1861470576
* Ian Allan ABC of British Railways Locomotives, 1949 edition, part 2, page 14

External links

* [http://www.railuk.co.uk/steam/getsteamclass.php?item=0415 Rail UK database]