Glasgow & South Western 0-4-4 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 520 (Locobase 20859)

Data from "Glasgow and South Western Railway Locomotive Rebuilds", Locomotive Magazine, Volume XXVII [25] (15 September 1921), p. 225.

Robert H Whitelegg, the G&SW's Chief Mechanical Engineer, enlarged both water and fuel capacity in the ten suburban tanks he had built earlier. Other than that change, the class remained as designed and continued to serve Glasgow's suburban lines.


Class unknown (Locobase 20864)

Data from "Glasgow and South Western Railway Locomotive Rebuilds", Locomotive Magaziner, Volume XXVII [25] (15November 1921), p. 286-387.

The original design of these suburban tanks came from Hugh Smellie, who put them into service on the Glasgow-Greenock run. But the railway found the locomotive's fuel and water capacity "too restricted" and the class was shifted to the Glasgow area.

As he did with the six-coupled goods locomotives described in Locobase 20863, Robert H Whitelegg, the G&SW's Chief Mechanical Engineer, enlarged both water and fuel capacity in four of the twenty engines. Extending thel bunker from 5 ft to 6 ft 9 in and raising the sides to 4 ft 7 increased water tankage to 1,200 Imp gall (5,450 litres) and coal capacity to 2 1/2 long tons (2.75 short tons).

Other than that change, the class remained as designed and continued to serve Glasgow and Ayr district suburban traffic.

Principal Dimensions by Steve Llanso of Sweat House Media

Class520unknown
Locobase ID20859 20864
RailroadGlasgow & South WesternGlasgow & South Western
CountryGreat BritainGreat Britain
Whyte0-4-4T0-4-4T
Number in Class
Road Numbers520
GaugeStdStd
Number Built
BuilderG&SWKilmarnock
Year19211879
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.50 / 2.29 7.50 / 2.29
Engine Wheelbase (ft / m)21.75 / 6.6321 / 6.40
Ratio of driving wheelbase to overall engine wheelbase 0.34 0.36
Overall Wheelbase (engine & tender) (ft / m)21.75 / 6.6321 / 6.40
Axle Loading (Maximum Weight per Axle) (lbs / kg)34,160 / 15,495
Weight on Drivers (lbs / kg)75,264 / 34,13965,072 / 29,516
Engine Weight (lbs / kg)121,408 / 55,070103,712 / 47,043
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)121,408 / 55,070103,712 / 47,043
Tender Water Capacity (gals / ML)1210 / 4.581200 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.36 / 3.10 1.70 / 1.50
Minimum weight of rail (calculated) (lb/yd / kg/m)63 / 31.5054 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 157567 / 1702
Boiler Pressure (psi / kPa)150 / 10.30140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)17.5" x 24" / 445x61018" x 26" / 457x660
Tractive Effort (lbs / kg)15,115 / 6856.0614,962 / 6786.66
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.98 4.35
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)101 / 9.3893 / 8.64
Grate Area (sq ft / m2)16.50 / 1.5315 / 1.39
Evaporative Heating Surface (sq ft / m2)1169 / 108.601025 / 95.23
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1169 / 108.601025 / 95.23
Evaporative Heating Surface/Cylinder Volume174.96133.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation24752100
Same as above plus superheater percentage24752100
Same as above but substitute firebox area for grate area15,15013,020
Power L138843042
Power MT227.54206.12

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