The 7200 Class were rebuilt from engines of the 4200 Class 2-8-0T engines which had limited coal and water capacity for working coal trains on the short journeys from the pits to the South Wales docks. When this trade was greatly reduced in the depression of the 1930s, some of these surplus engines were provided with additional coal and water capacity to run on the main lines and replace some of the elderly 2-6-0 "Aberdare" Class.

7200 was completed at the Swindon Factory in the UK on the 20th July 1930 but did not enter service and remained in Swindon stock. She re-entered the Factory on the 23rd July 1934 for alteration to 2-8-2T arrangement, which cost £200. Somehow during this period she achieved a mileage of 1,408 miles. Her original building cost was £4,380 which included £933 for the boiler.

Sheds of 7200

19.9.1934-1941	Llanelly
June 1941	Pantyffynnon/Llanelly
March 1942-1944	Llanelly
4.7.1944	Caerphilly Factory G
14.10 1944-1947	Llanelly
23.1.1947-1952	Newton Abbot
February 1952	St Blazey
15.7.60	Duffryn Yard
31.10.1963	Llanelly

She was withdrawn from service on the 8th July 1963 and was subsequently sold as scrap metal to Woodham Brothers, Barry Island, Wales. She was later sold to Quainton Railway Centre, Aylesbury, Buckinghamshire, United Kingdom where she arrived in September 1981, and repairs were in progress in 1992. Below are some technical details about the 7200 Class 2-8-T Goods Engine.

Technical Data for the 7200 Class 2-8-T Goods Engine

Boiler class	Swindon standard 4
Working pressure	200 lbs p.s.i.
Barrel(outside diam front)	4'11"
Barrel(outside diam rear)	5'6"
Length between tube plates	11'
Tubes (Superheater units no 14)	6 tubes diam 1"
Tubes (Superheater units no 14)	4 tubes diam 1¼"
Length of tubes	11'
Large tubes no 14	5 and 5/8"
Small tubes	235 diam 1 and 5/8"
Heating surface tubes	1350sq ft
Superheating surface area	192sq ft
Total heating surface	6 tubes 1659sq ft
Total heating surface	4 tubes 1615sq ft
Firebox outside measurements	7'x 5'9"/4'0"
Firebox inside measurements	6'2½" x 4'8½" x 3'2¾"
Grate incline to front	10º
Grate area	20.56sq ft
Heating surface	129sq ft
Cylinders(2)	diam 19"
Piston stroke	30"
Cylinder centre to 1st coupled	5'
Adhesion weight	73 tons
Engine weight full	92 tons 12cwt
Engine weight empty	73 tons 11cwt
Wheel diam coupled	4'7½"
Wheel diam front pony	3'2"
Wheel diam rear trailing	3'8"
Axle weight front pony	9 ton 7cwt
Axle weight first coupled	18 ton 14cwt
Axle weight second coupled	18 ton 10cwt
Axle weight third coupled	17 ton 18cwt
Axle weight rear coupled	17 ton 13cwt
Axle weight rear trailing	10 ton 10cwt
Outside engine overall length	44'10"
Height to smokebox centre	8'2"
Height to cab roof centre	12'10"
Water tank capacity	2500 gallons
Coal capacity	6 tons
Minimum curve	6 chains normal 5 chains slow

Modified: 2 December 2007
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