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.
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 Middle Run Media | ||
---|---|---|
Class | 520 | unknown |
Locobase ID | 20859 | 20864 |
Railroad | Glasgow & South Western | Glasgow & South Western |
Country | Great Britain | Great Britain |
Whyte | 0-4-4T | 0-4-4T |
Number in Class | ||
Road Numbers | 520 | |
Gauge | Std | Std |
Number Built | ||
Builder | G&SW | Kilmarnock |
Year | 1921 | 1879 |
Valve Gear | Stephenson | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 7.50 / 2.29 | 7.50 / 2.29 |
Engine Wheelbase (ft / m) | 21.75 / 6.63 | 21 / 6.40 |
Ratio of driving wheelbase to overall engine wheelbase | 0.34 | 0.36 |
Overall Wheelbase (engine & tender) (ft / m) | 21.75 / 6.63 | 21 / 6.40 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 34,160 / 15,495 | |
Weight on Drivers (lbs / kg) | 75,264 / 34,139 | 65,072 / 29,516 |
Engine Weight (lbs / kg) | 121,408 / 55,070 | 103,712 / 47,043 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
Tender Water Capacity (gals / ML) | 1210 / 4.58 | 1200 / 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 / 31.50 | 54 / 27 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 62 / 1575 | 67 / 1702 |
Boiler Pressure (psi / kPa) | 150 / 1030 | 140 / 970 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17.5" x 24" / 445x610 | 18" x 26" / 457x660 |
Tractive Effort (lbs / kg) | 15,115 / 6856.06 | 14,962 / 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 / 9.38 | 93 / 8.64 |
Grate Area (sq ft / m2) | 16.50 / 1.53 | 15 / 1.39 |
Evaporative Heating Surface (sq ft / m2) | 1169 / 108.60 | 1025 / 95.23 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 1169 / 108.60 | 1025 / 95.23 |
Evaporative Heating Surface/Cylinder Volume | 174.96 | 133.85 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 2475 | 2100 |
Same as above plus superheater percentage | 2475 | 2100 |
Same as above but substitute firebox area for grate area | 15,150 | 13,020 |
Power L1 | 3884 | 3042 |
Power MT | 227.54 | 206.12 |