GWR 3800 Class

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GWR 3800 'County' Class
GWR 3818 County of Radnor (Boys' Book of Locomotives, 1907).jpg
3818 County of Radnor
Type and origin
Power type Steam
Designer George Jackson Churchward
Builder Swindon Works, Great Western Railway
Order numberLots 149, 165, 184
Serial number2056–2065, 2209–2228, 2415–2425
Build date1904, 1906, 1911–12
Total produced40
Specifications
Configuration:
   Whyte 4-4-0
Gauge 4 ft 8+12 in (1,435 mm) standard gauge
Leading dia. 3 ft 2 in (965 mm)
Driver dia.6 ft 8+12 in (2,045 mm)
Wheelbase 24 ft 0 in (7,315 mm)
Axle load 18.15 long tons (18.44 t; 20.33 short tons)
Adhesive weight 34.3 long tons (34.85 t; 38.42 short tons)
Loco weight55.3 long tons (56.19 t; 61.94 short tons)
Tender weight36.75 long tons (37.34 t; 41.16 short tons)
Total weight92.05 long tons (93.53 t; 103.10 short tons)
Fuel type Coal
Water cap.3,000 imp gal (13,638 L; 3,603 US gal)
Firebox:
  Grate area20.56 sq ft (1.91 m2)
BoilerGWR Standard No. 4
Boiler pressure200 psi (1,379 kPa)
Heating surface1,818.12 sq ft (168.91 m2)
  Tubes1,689.82 sq ft (156.99 m2)
  Firebox128.30 sq ft (11.92 m2)
Cylinders 2, outside
Cylinder size 18 in × 30 in (457 mm × 762 mm)
diameter x stroke
Valve gear Stephenson
Performance figures
Tractive effort 20,530 lbf (91 kN)
Career
Operators Great Western Railway
Class 3800
Power class GWR: C
Number in class40
Numbers3473–82, 3801–30 until Dec 1912
3800–39 from December 1912
Official nameCounty
NicknamesChurchward's Rough Riders
Axle load class GWR: Red
Withdrawn1930–33
DispositionAll original locomotives scrapped; one new-build under construction
Dimensions as built [1]

The Great Western Railway 3800 Class, also known as the County Class, were a class of 4-4-0 steam locomotives for express passenger train work introduced in 1904 in a batch of ten. Two more batches followed in 1906 and 1912 with minor differences. They were designed by George Jackson Churchward, who used standard components to produce a four-coupled version of his Saint Class 4-6-0s.

Contents

Construction

The first locomotive, No. 3473 County of Middlesex, was built at Swindon Works in May 1904, with the following nine completed by October 1904. [2] They were initially fitted with parallel-sided copper-capped chimneys, which were soon replaced by tapered cast iron chimneys. [3] The second batch, of twenty, were built between October and December 1906. This batch had tapered cast iron chimneys from the start. [4] A third and last batch of ten were built between December 1911 and February 1912. [5] On these the footplates had curved drop ends at the cab and front bufferbeam. [6] They were also fitted from new with a superheater and top feed. [5] Chimneys were a larger version of the copper-capped type of the first batch. [3]

Coupled wheels had independent springing, without the compensating beams fitted between the axleboxes on Churchward's 4-6-0s. [7] The cylinder block, including the piston valves and smokebox saddle, was constructed from two castings from the same pattern, bolted back to back, each casting containing one half of the saddle. [2] The cab, boiler and coupled wheels were attached to plate frames. The cylinder block was carried on two bar frames, bolted to the front end of the plate frames. [7] The piston valves were driven by Stephenson valve gear. The class were fitted with the Standard No. 4 boiler. [2] One locomotive, No. 3805 County Kerry was fitted with a smaller Standard No. 2 boiler between November 1907 and May 1909. [4]

Table of orders and numbers [8]
YearQuantityLot No.Works Nos.Locomotive numbersNotes
1904101492056–20653473–3482renumbered 3800, 3831–3839 in 1912
1906201652209–22283801–3820
1911–12101842416–24253821–3830

Operation

They were the last new GWR 4-4-0 design and by far the most modern, with inside frames and outside cylinders. They were designed as a part of Churchward's standardisation plan, but were found to have a front end too powerful for the wheel arrangement and all were withdrawn by the early 1930s. They were designed, in part, for the Hereford to Shrewsbury LNWR line over which the GWR had running powers, but on which they were expressly forbidden to use 4-6-0 locomotives. The 4-4-0 Counties were in effect a shortened GWR 2900 Class, providing engines powerful enough for the trains but with the requisite four-coupled wheels.

The key components were all proven but the combination was somewhat poor, and perhaps the least successful of Churchward's designs. From the outset they were found to be rough riders but were otherwise effective locos. All other GWR 4-4-0s were inside-cylindered and none had a piston stroke greater than 26 inches, whereas the 'County' had a 30-inch stroke driving a meagre 8 ft 6 ft wheelbase.

The County Class used the same cylinders and motion as Churchward's six-coupled locomotives and required the same mass to counterbalance the reciprocating parts of the motion. However the weight required had to be divided between four driving wheels rather than six. The heavier balance weights produced a high level of wheel hammer blow; at six revolutions per second the hammer blow was 8 tons, compared with the 3.6 tons of the inside-cylindered City Class and the 6.4 tons of the six-coupled Saint Class. The left hand trailing axleboxes often developed hammering, which was caused by the amount of counterbalancing used. [9]

This class were subject to the 1912 renumbering of GWR 4-4-0 locomotives, which saw the Bulldog class gathered together in the series 3300–3455, and other types renumbered out of that series. The County Class took numbers 3800–3839.

3833 County of Dorset was the first to be withdrawn, in February 1930. By the end of 1933 all had gone, the last survivor being No. 3834 County of Somerset, withdrawn in November of that year. [10]

County Tank 2221 GWR County tank class 2221 (Howden, Boys' Book of Locomotives, 1907).jpg
County Tank 2221

They were also the basis for the 'County Tank' GWR 2221 Class design, a 4-4-2T using the same basic design as the County but with a smaller and lighter boiler, and the replacement of the tender by the addition of side tanks, bunker and trailing axle.

NumbersName
FirstSecond (1912)
34733800 County of Middlesex
38013801 County Carlow
38023802 County Clare
38033803 County Cork
38043804 County Dublin
38053805 County Kerry
38063806 County Kildare
38073807 County Kilkenny
38083808 County Limerick
38093809 County Wexford
38103810 County Wicklow
38113811 County of Bucks
38123812 County of Cardigan
38133813 County of Carmarthen
38143814 County of Chester
38153815 County of Hants
38163816 County of Leicester
38173817 County of Monmouth
38183818 County of Radnor
38193819 County of Salop
38203820 County of Worcester
38213821 County of Bedford
38223822 County of Brecon
38233823 County of Carnarvon
38243824 County of Cornwall
38253825 County of Denbigh
38263826 County of Flint
38273827 County of Gloucester
38283828 County of Hereford
38293829 County of Merioneth
38303830 County of Oxford
34743831 County of Berks
34753832 County of Wilts
34763833 County of Dorset
34773834 County of Somerset
34783835 County of Devon
34793836 County of Warwick
34803837 County of Stafford
34813838 County of Glamorgan
34823839 County of Pembroke

Preservation

No members of the class were preserved. However, the Great Western Society took the decision to create the next locomotive in the sequence, 3840 County of Montgomery. [11] The project has been handed over to the Churchward County Trust and 3840 will be based at the Gloucestershire Warwickshire Railway following its construction at Tyseley Locomotive Works in Birmingham. The locomotive is being built with both new parts, such as the driving wheels which have been cast using the pattern created for GWS Saint Class 2999 "Lady of Legend", and recycled standard parts recovered from former Barry scrapyard locomotives including the Standard No. 4 Boiler, the pony truck wheel set, 2 x pony truck axle boxes, 4 x horn guides and 2 x eccentric sheaves from 5205 Class 2-8-0T 5227, and 4 x driving wheel axle boxes from 2800 Class 2-8-0 2861.

Models

Hornby Railways manufacture a model of the 38xx in OO gauge. 3mm Scale Model Railways manufacture a model kit of the 38xx in TT gauge. Hornby manufactured between 1931-1936 electric and clockwork tin-plate models of the 3821 County of Bedford in 0 gauge.

See also

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References

  1. le Fleming 1962, pp. J10–J12
  2. 1 2 3 Nock 1978 , p. 14
  3. 1 2 Haresnape & Swain 1993 , p. 56
  4. 1 2 Nock 1978 , p. 15
  5. 1 2 Nock 1978 , p. 38
  6. Holcroft 1971 , p. 102
  7. 1 2 Nock 1978 , p. 13
  8. Allcock et al. (1968), pp. 30–31.
  9. Nock 1978 , p. 16
  10. Nock 1978 , p. 66
  11. "Churchward County Trust". Churchward County Trust. Retrieved 22 August 2018.

Bibliography