Pembroke & Tenby 2-4-0 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class Pembroke (Locobase 4898)

Data from Graham Davies at members.tripod.co.uk/Graham_Davies/index-51.html (dead link, but see "Pembroke and Monkton Local History Society--Pembroke Railway" on the Tenby Observer's13 August 2013 edition at [link], last accessed 18 October 2022 . See also "Railways in West Wales Part 1B - Pembrokeshire - the Mainline Railways" on Roger Farnworth's blog at [link], last accessed 22 September 2022; and "Pembroke and Tenby Railway" in Wikipedia at [link], last accessed 18 October 2022 for a full account of the tortuous series of events that accompanied the P&T's 19th Century existence. Works number was 1845 in 1868.

The Pembroke and Tenby was formed in 1859 (as the South Wales, Pembroke & Tenby) with construction beginning soon thereafter. As passenger service grew, the railroad needed a larger, specifically passenger-service engine. The line bought what Graham Davies describes as one of Sharp, Stewart's standard 2-4-0s. And the illustration bears him out. Davies notes that three of this class were built at the time, two for the P&T, one for the Manchester & Milford. In the event, only the Pembroke went to the P&T.

A rebuilding in 1887 raised boiler pressure to 140 psi, but otherwise left the basic dimensions as shown here unchanged. (Although one source said that the boiler had 103 tubes after rebuilding, Davies reports, he adds that the GWR inspector found 156 tubes after the takeover.)

The Great Western took over the P & T in 1896 and renumbered Pembroke as 1361. She was scrapped in 1902.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassPembroke
Locobase ID4898
RailroadPembroke & Tenby
CountryGreat Britain
Whyte2-4-0
Number in Class1
Road Numbers3/1361
GaugeStd
Number Built1
BuilderSharp, Stewart
Year1868
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.50 / 1.98
Engine Wheelbase (ft / m)14.25 / 4.34
Ratio of driving wheelbase to overall engine wheelbase 0.46
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)55,552 / 25,198
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1440 / 5.45
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.30 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)66 / 1676
Boiler Pressure (psi / kPa)120 / 830
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x508
Tractive Effort (lbs / kg)7913 / 3589.28
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)157 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.25 / 3.12
Firebox Area (sq ft / m2)71.40 / 6.63
Grate Area (sq ft / m2)
Evaporative Heating Surface (sq ft / m2)915 / 85.01
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)915 / 85.01
Evaporative Heating Surface/Cylinder Volume196.60
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation
Same as above plus superheater percentage
Same as above but substitute firebox area for grate area8568
Power L13608
Power MT

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