London & South Western 4-6-2 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class H16 Green Tanks (Locobase 2364)

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 Sweat House Media

ClassH16 Green Tanks
Locobase ID2364
RailroadLondon & South Western
CountryGreat Britain
Number in Class5
Road Numbers516-520/E 516-E520
Number Built5
Valve GearWalschaert
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)215,936 / 97,947
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 / 12.40
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 Volume125.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4860
Same as above plus superheater percentage5540
Same as above but substitute firebox area for grate area28,523
Power L17485
Power MT374.58

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