Data from "Locomotives of the Great Eastern", Locomotive Magazine, Volume 17 (15 May 1911) p. 99-100. Works numbers were 2595-2596 in 1876.
Although these two were the largest of the T&W locomotives, they showed a toy-like appearance through an oversized cab and relatively tall drivers that dminished the boiler's apparent dimensions.
The 6 & 7 served the Bury St Edmonds-Swaffham section. After their lease to the Great Eastern and renumbering to 806-807, the engines were rebuilt by the GER's Stratford Works with Westinghouse brakes and Ramsbottom safety valves. Renumbered again in 1886, the 0806 was scrapped in December 1890 and 0807 a year later.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 6 |
| Locobase ID | 20042 |
| Railroad | Thetford & Watton |
| Country | Great Britain |
| Whyte | 0-4-2 |
| Number in Class | 2 |
| Road Numbers | 6-7/806-807 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Sharp, Stewart |
| Year | 1876 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.75 / 2.06 |
| Engine Wheelbase (ft / m) | 13.25 / 4.04 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.51 |
| Overall Wheelbase (engine & tender) (ft / m) | 12.25 / 3.73 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 23,072 / 10,465 |
| Weight on Drivers (lbs / kg) | 44,660 / 20,257 |
| Engine Weight (lbs / kg) | 56,616 / 25,681 |
| Tender Loaded Weight (lbs / kg) | 31,360 / 14,225 |
| Total Engine and Tender Weight (lbs / kg) | 87,976 / 39,906 |
| Tender Water Capacity (gals / ML) | 1440 / 5.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.10 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 37 / 18.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 120 / 830 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 |
| Tractive Effort (lbs / kg) | 8415 / 3816.98 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.31 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 192 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.25 / 3.12 |
| Firebox Area (sq ft / m2) | 74 / 6.87 |
| Grate Area (sq ft / m2) | 11.50 / 1.07 |
| Evaporative Heating Surface (sq ft / m2) | 975 / 90.58 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 975 / 90.58 |
| Evaporative Heating Surface/Cylinder Volume | 216.68 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1380 |
| Same as above plus superheater percentage | 1380 |
| Same as above but substitute firebox area for grate area | 8880 |
| Power L1 | 3587 |
| Power MT | 354.14 |