Data from [], last accessed 8 October 2022.
Developed as part of the range of twelve Standard engine designs that entered British Railway service in the 1950s. These duplicated the 20 Class 2MT engines (6400-6419) designed by HG Ivatt and delivered to the London, Midland & Scottish in 1946-47. All had a Belpaire firebox.
RA Riddles intended this locomotive for light branch-line duties where it served very well. According to the [] website (viewed April 2002), these engines "incorporated several recent improvements in locomotive design that reduced maintenance and gave the footplate crew a degree of comfort lacking on earlier engines." The site adds that the class was also known for its "quite snappy acceleration" and "good turn of speed."
Four were preserved when the rest were discarded. One of those began a rebuild as a tank engine on the Bluebell Railway.
Data from David Faulkner (compiler), British Railways Standard Locomotive Diagrams, self-published 2018.
Developed as part of the range of twelve Standard engine designs that entered British Railway service in the 1950s. Directed by Chief Mechanical Engineer RA Riddles, development of this class drew on an earlier Great Western 2-6-2 design.
See also [] (26 Sept 2004), which was restoring of these locomotives
Developed as part of the range of 12 Standard engine designs that entered British Railway service in the 1950s. RA Riddles oversaw development, in this case of an engine that was based on the earlier LMS Class 4. It showed outside valve gear and pistons as well as a Belpaire boiler. From the side, the angular firebox seems outsized compared to the coned second course and straight first course of the boiler.
OS Nock (RWC VI, pl 58) pronounces the design "a truly excellent medium-power unit, having a fine turn of speed, and useful on passenger as well as goods trains."
Nock adds that 76114 was the last engine to come out of the former Great Northern's Doncaster works. 25 other were produced were produced at that plant, 45 at ex-Lancashire & Yorkshire's Horwich Works, and 45 at the ex-Midland Works at Derby.
Principal Dimensions by Steve Llanso of Middle Run Media | |||
---|---|---|---|
Class | Class 2 | Class 3 | Class 4 |
Locobase ID | 2369 | 2371 | 2370 |
Railroad | British Railways | British Railways | British Railways |
Country | Great Britain | Great Britain | Great Britain |
Whyte | 2-6-0 | 2-6-0 | 2-6-0 |
Number in Class | 108 | 20 | 115 |
Road Numbers | 78000-78064 | 77000-77019 | 76000-76114 |
Gauge | Std | Std | Std |
Number Built | 108 | 20 | 115 |
Builder | Darlington | Darlington | Darlington |
Year | 1953 | 1954 | 1952 |
Valve Gear | Walschaert | Walschaert | Walschaert |
Locomotive Length and Weight | |||
Driver Wheelbase (ft / m) | 13.75 / 4.19 | 15.33 / 4.67 | 15.33 / 4.67 |
Engine Wheelbase (ft / m) | 22.25 / 6.78 | 24.08 / 7.34 | 24.08 / 7.34 |
Ratio of driving wheelbase to overall engine wheelbase | 0.62 | 0.64 | 0.64 |
Overall Wheelbase (engine & tender) (ft / m) | 44.25 / 13.49 | 469.80 | 46.94 / 14.31 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 30,800 / 13,971 | 36,400 / 16,511 | 37,520 / 17,019 |
Weight on Drivers (lbs / kg) | 90,720 / 41,150 | 108,640 / 49,278 | 113,120 / 51,310 |
Engine Weight (lbs / kg) | 110,208 / 49,990 | 128,800 / 58,423 | 132,384 / 60,048 |
Tender Loaded Weight (lbs / kg) | 82,544 / 37,441 | 94,416 / 42,826 | 94,116 / 42,690 |
Total Engine and Tender Weight (lbs / kg) | 192,752 / 87,431 | 223,216 / 101,249 | 226,500 / 102,738 |
Tender Water Capacity (gals / ML) | 3600 / 13.64 | 4200 / 15.91 | 4200 / 15.91 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 | 6.60 / 6 | 6.70 / 6 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 50 / 25 | 60 / 30 | 63 / 31.50 |
Geometry Relating to Tractive Effort | |||
Driver Diameter (in / mm) | 60 / 1524 | 63 / 1600 | 63 / 1600 |
Boiler Pressure (psi / kPa) | 200 / 1380 | 200 / 1380 | 225 / 1550 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16.5" x 24" / 419x610 | 17.5" x 26" / 445x660 | 17.5" x 26" / 445x660 |
Tractive Effort (lbs / kg) | 18,513 / 8397.37 | 21,486 / 9745.90 | 24,172 / 10964.25 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.90 | 5.06 | 4.68 |
Heating Ability | |||
Tubes (number - dia) (in / mm) | 162 - 1.625" / 41 | 145 - 1.625" / 41 | 160 - 1.625" / 41 |
Flues (number - dia) (in / mm) | 12 - 5.125" / 130 | 18 - 5.125" / 130 | 24 - 5.125" / 130 |
Flue/Tube length (ft / m) | 10.85 / 3.31 | 10.85 / 3.31 | 10.85 / 3.31 |
Firebox Area (sq ft / m2) | 101 / 9.38 | 118.40 / 11 | 131 / 12.17 |
Grate Area (sq ft / m2) | 17.50 / 1.63 | 20.30 / 1.89 | 23 / 2.14 |
Evaporative Heating Surface (sq ft / m2) | 1025 / 95.23 | 1051 / 97.64 | 1090 / 101.30 |
Superheating Surface (sq ft / m2) | 134 / 12.45 | 190 / 17.65 | 231 / 21.47 |
Combined Heating Surface (sq ft / m2) | 1159 / 107.68 | 1241 / 115.29 | 1321 / 122.77 |
Evaporative Heating Surface/Cylinder Volume | 172.57 | 145.20 | 150.59 |
Computations Relating to Power Output (More Information) | |||
Robert LeMassena's Power Computation | 3500 | 4060 | 5175 |
Same as above plus superheater percentage | 3920 | 4669 | 6055 |
Same as above but substitute firebox area for grate area | 22,624 | 27,232 | 34,486 |
Power L1 | 9213 | 9728 | 12,481 |
Power MT | 671.67 | 592.23 | 729.73 |