Data from "The Barry Ry Locomotives and Works," The Locomotive Magazine, Volume XI [11] (15 February 1905), p.27; and "Barry Railway", The Locomotive Magazine, Volume XXIX [29] (15 February 1923), p. 36-39; and (15 June 1923), p. 169. Works numbers 4182-4183 in September 1896.and 4184-4188 in October.
Introducing the eight-coupled radial tank layout to Great Britain, this class of mineral-train haulers had no other purpose other than to knuckle down and pull long, heavy freight trains. Barry based these tanks on the four D class (Locobase 20956) locomotives made available after a Scandinavian bankruptcy, but was able to increase both bunker and water-tank capacity while reducing overall wheelbase.
According to the LM report, the class was rated at 1,280 tons (80 loaded wagons) down the Barry-Trehafod section and 480 tons (80 empties) up the grade. On the more precipitous Vale of Glamorgan section, they were rated to pull 560 tons up the grade (35 wagons) and 270 tons (45 empty) down.
Although the Great Western' went to some trouble to refit the class with larger bunkers, new buffers, an extended smokebox, the design didn't really fit their requirements. So from the time of Grouping in 1922 to their retirement spanned at most eight years and in some cases only three years.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | H |
| Locobase ID | 10488 |
| Railroad | Barry |
| Country | Great Britain |
| Whyte | 0-8-2T |
| Number in Class | 7 |
| Road Numbers | 79-85 |
| Gauge | Std |
| Number Built | 7 |
| Builder | Sharp, Stewart |
| Year | 1896 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15.42 / 4.70 |
| Engine Wheelbase (ft / m) | 22.92 / 6.99 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.67 |
| Overall Wheelbase (engine & tender) (ft / m) | 22.92 / 6.99 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 140,672 / 63,808 |
| Engine Weight (lbs / kg) | 167,552 / 76,000 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2520 / 9.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.90 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 59 / 29.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 26,000 / 11793.42 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.41 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 188 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.83 / 4.22 |
| Firebox Area (sq ft / m2) | 115 / 10.69 |
| Grate Area (sq ft / m2) | 22.75 / 2.11 |
| Evaporative Heating Surface (sq ft / m2) | 1476 / 137.17 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1476 / 137.17 |
| Evaporative Heating Surface/Cylinder Volume | 156.13 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3413 |
| Same as above plus superheater percentage | 3413 |
| Same as above but substitute firebox area for grate area | 17,250 |
| Power L1 | 2766 |
| Power MT | 173.40 |