Data from "Urie G16 class 4-6-2T", Southern Railway E-Group at [], last accessed 16 September 2018; and "London and South Western Railway Locomotives", Volume XXVII [27], No. 343 (15 March 1921), pp. 53-55; and Volume XXVIII [28] (14 January 1922), pp 6-7. (Thanks to Alexander Blessing for his 11 July 2023 supplying the correct engine wheelbase.)
Robert Urie's Pacific tank engine built on the same boiler, firebox, valve motion, front bogie as the 4-8-0T of the same year. They were delivered with Urie's Eastleigh superheater, which was later replace by Maunsell's design. To extend their radius, the Pacifics were fitted with larger bunker. A profile shows the unequal driver spacing, the front two clustered two feet (610 mm) closer together than the distance between the middle driven axle and the rear one.
They had 11 in (279 mm) piston valves with 5 1/8" (130 mm) maximum travel.
The Southern Railway E-Group notes that "They were primarily intended for goods traffic between Feltham and Brent (MR) and Willesden (LNWR). Although they were used on special passenger trains, such as during Ascot Race Week, they were not wholly suitable for such jobs with their limited water supply and rough riding when running bunker first .... During the 1950s the H16s were regularly employed on Clapham Jc-Waterloo empty stock duties and in their final years found regular employment on the Fawley branch oil trains."
Retired by the end of 1962, none of the class was preserved.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | H16 Green Tanks |
Locobase ID | 2364 |
Railroad | London & South Western |
Country | Great Britain |
Whyte | 4-6-2T |
Number in Class | 5 |
Road Numbers | 516-520/E 516-E520 |
Gauge | Std |
Number Built | 5 |
Builder | Eastleigh |
Year | 1921 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 15 / 4.57 |
Engine Wheelbase (ft / m) | 36.42 / 11.13 |
Ratio of driving wheelbase to overall engine wheelbase | 0.41 |
Overall Wheelbase (engine & tender) (ft / m) | 36.42 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 44,352 |
Weight on Drivers (lbs / kg) | 132,160 / 59,947 |
Engine Weight (lbs / kg) | 215,936 / 97,947 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 2400 / 9.09 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.90 / 3.50 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 73 / 36.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 67 / 1702 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 28" / 533x711 |
Tractive Effort (lbs / kg) | 28,198 / 12790.41 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.69 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 160 - 1.75" / 44 |
Flues (number - dia) (in / mm) | 21 - 5.25" / 133 |
Flue/Tube length (ft / m) | 12.50 / 3.81 |
Firebox Area (sq ft / m2) | 139 / 12.91 |
Grate Area (sq ft / m2) | 27 / 2.51 |
Evaporative Heating Surface (sq ft / m2) | 1406 / 130.62 |
Superheating Surface (sq ft / m2) | 231 / 21.46 |
Combined Heating Surface (sq ft / m2) | 1637 / 152.08 |
Evaporative Heating Surface/Cylinder Volume | 125.26 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4860 |
Same as above plus superheater percentage | 5540 |
Same as above but substitute firebox area for grate area | 28,523 |
Power L1 | 7485 |
Power MT | 374.58 |