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    UKP: GWR Castle

    Steam loco

    4073 Castle Class 4-6-0

    The 4073 or Castle Class are 4-6-0 steam locomotives of the Great Western Railway, built between 1923 and 1950. They were designed by the railway's Chief Mechanical Engineer, Charles Collett, for working the company's express passenger trains. They could reach speeds of up to 100 mph.

    Charles Collett succeeded Churchward as Chief Mechanical Engineer of the GWR in 1922 and immediately set about meeting the need for a new locomotive design that would both supplement the Stars and replace them on the heaviest expresses. Collett's solution was to take the basic layout of the Star with an extended frame and add a newly designed No.8 boiler which was both larger and lighter.

    The increased amount of steam that this produced allowing an increase in the cylinder diameter from 15 in × 26 in to 16 in × 26 in. The extended frame allowed for a side window cab and an increased grate area. The result was an increase in tractive effort to 31,625 lb, and a locomotive that looked attractive and well-proportioned while remaining within the 20-ton axle limit. When introduced they were heralded as Britain's most powerful express passenger locomotive, being some 10% more powerful than the Stars.

    The Castles handled all but the heaviest loads, these being entrusted to the 30-strong King Class, themselves a development of the Castles with an even larger boiler and smaller wheels (6 ft 6 in diameter) for both increased tractive effort and to allow for loading gauge clearance.

    171 were produced, eight have been preserved, six have operated in preservation. 

    Builder GWR/BR Swindon Works
    Introduced 1923
    Weight 79+47t
    TE 31625lbf
    Driving Wheel Dia 6ft 8 1/2in
    Wheel Arrangement 4-6-0
    Boiler Pressure 225lbf
    Cylinder Dimensions 16in x 26in
    Num Cylinders 4
    Valve Gear Walschaerts
    Length 65ft 2in
    Width 8ft 11in
    Height 13ft 4 1/2in
    Withdrawn 1965
    Max Speed 100mph
    Webpage Lots 224, 232, 234, 280, 295, 296, 303, 310, 317, 324, 357, 367, 375
    Number Altnumber Name Status Livery Depot Pool Base Owner
    4073 Caerphilly Castle D GRN PR Steam - Museum of the GWR - Swindon PRE
    4079 Pendennis Castle A DI Didcot Railway Centre PRE
    5029 98728 Nunney Castle O GRN SH LSLS Locomotive Services, Crewe PRE
    5043 98743 Earl of Mount Edgcumbe A GRN TM MBSL Tyseley Locomotive Works PRE
    5051 98751 Earl Bathurst D GRN DI MBSL Didcot Railway Centre PRE
    5080 98780 Defiant D GRN TM Tyseley Locomotive Works PRE
    7027 Thornbury Castle R PR Great Central Railway PRE
    7029 98729 Clun Castle A GRN TM MBSL Tyseley Locomotive Works PRE