Data from Richard Marsden, "The Hill N7 (GER Class L77) 0-6-2T Locomotives" in his LNER Encyclopedia at [], last accessed 28 February 2022.
Data from "New Suburban Tank Locomotives, London & North Eastern Ry - Great Eastern Section ", Locomotive Magazine, Volume XXX [30], No 377 (15 January 1924), p. 1; and Richard Marsden, "The Hill N7 (GER Class L77) 0-6-2T Locomotives" in his LNER Encyclopedia at [], last accessed 28 February 2022.
Principal Dimensions by Steve Llanso of Sweat House Media | ||
---|---|---|
Class | N7/3 | N7GE, N7/1, N7/2 |
Locobase ID | 20988 | 20987 |
Railroad | LNER | LNER |
Country | Great Britain | Great Britain |
Whyte | 0-6-2T | 0-6-2T |
Number in Class | 48 | 80 |
Road Numbers | 2600-2631/9701-9733 | 990-999/7990-7999/9612-9701 |
Gauge | Std | Std |
Number Built | 32 | 80 |
Builder | Stratford Works | Stratford Works |
Year | 1927 | 1923 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 16.25 / 4.95 | 16.25 / 4.95 |
Engine Wheelbase (ft / m) | 23 / 7.01 | 23 / 7.01 |
Ratio of driving wheelbase to overall engine wheelbase | 0.71 | 0.71 |
Overall Wheelbase (engine & tender) (ft / m) | 23 / 7.01 | 23 / 7.01 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 38,976 / 17,679 | 39,984 / 18,136 |
Weight on Drivers (lbs / kg) | 111,776 / 50,701 | |
Engine Weight (lbs / kg) | 139,776 / 63,401 | 139,776 / 63,401 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | 139,776 / 63,401 | 139,776 / 63,401 |
Tender Water Capacity (gals / ML) | 1920 / 7.27 | 1920 / 7.27 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.85 / 3.50 | 3.85 / 3.50 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 62 / 31 | |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 58 / 1473 | 58 / 1473 |
Boiler Pressure (psi / kPa) | 180 / 12.40 | 180 / 12.40 |
High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 | 18" x 24" / 457x610 |
Tractive Effort (lbs / kg) | 20,513 / 9304.55 | 20,513 / 9304.55 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.45 | |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 132 - 1.75" / 44 | 138 - 1.75" / 44 |
Flues (number - dia) (in / mm) | 18 - 5.25" / 133 | 18 - 5.25" / 133 |
Flue/Tube length (ft / m) | 9.75 / 2.97 | 9.75 / 2.97 |
Firebox Area (sq ft / m2) | 107.30 / 9.97 | 110.20 / 10.24 |
Grate Area (sq ft / m2) | 17.70 / 1.64 | 17.70 / 1.64 |
Evaporative Heating Surface (sq ft / m2) | 938 / 87.14 | 968 / 89.93 |
Superheating Surface (sq ft / m2) | 134 / 12.45 | 134 / 12.45 |
Combined Heating Surface (sq ft / m2) | 1072 / 99.59 | 1102 / 102.38 |
Evaporative Heating Surface/Cylinder Volume | 132.70 | 136.94 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 3186 | 3186 |
Same as above plus superheater percentage | 3600 | 3568 |
Same as above but substitute firebox area for grate area | 21,825 | 22,216 |
Power L1 | 6598 | 6708 |
Power MT | 396.92 |