Data from "Three-Cylinder 'Pacific' Type Express Locomotive, North Eastern Railway", Railway Engineer, Volume 43, No. 6 (June 1922), p. 219.
Designed by Vincent Raven at the same time Nigel Gresley premiered his A1, this engine would fade into the background once the North Eastern and Great Northern were grouped. According to Glover (1967) , the design showed " a rigid -- perhaps a too rigid -- adherence to existing practice in the production of a new type." A long, 72"-diameter boiler wasted some of the heat generated in a relatively large, but conventionally arranged firebox of 200 sq ft heating surface. Raven's cast group of three cylinders drove on the front axle, . All five were named for cities in the NER: City of Newcastle, ..Kingston-upon-Hull, ...York, ...Durham, and ...Ripon, respectively. When they came into the LNER soon afterward, they were classed A2. As odd class out among LNER Pacifics, they lasted only until 1936-1937.
Data from "Class 'W' Rebuilt Tank Locomotive, North-Eastern Ry.", Locomotive Magazine, Volume XXV [25] (15 October 1919), pp. 164-165; and Richard Marsden, "The Wilson Worsdell A6 Pacific Tank Locomotives" from his LNER site -- [] (first accessed January 2004, last accessed 13 June 2020)..
Data from "4-6-2 Mineral Tank Engines, NER", The Locomotive Magazine, Volume XVII [17] (14 January 1911), p. 4. See also steamindex's summary of literature on this class--"Y class: 1911: LNER class A7"-- at [].
Richard Marsden's LNER site -- [] (Jan 2004) for data.
Principal Dimensions by Steve Llanso of Sweat House Media | ||||
---|---|---|---|---|
Class | City of... / A2 | W1 - rebuilt/A6 | Y | Y/A7 |
Locobase ID | 2338 | 6323 | 20025 | 5910 |
Railroad | North Eastern | North Eastern | North Eastern | North Eastern |
Country | Great Britain | Great Britain | Great Britain | Great Britain |
Whyte | 4-6-2 | 4-6-2T | 4-6-2T | 4-6-2T |
Number in Class | 5 | 10 | 20 | 20 |
Road Numbers | 2400-2404 | 686-695/9790-9799/69791-69799 | ||
Gauge | Std | Std | Std | Std |
Number Built | 5 | 20 | ||
Builder | North Eastern | Darlington | Darlington | |
Year | 1923 | 1914 | 1910 | 1917 |
Valve Gear | Stephenson | Stephenson | Stephenson | |
Locomotive Length and Weight | ||||
Driver Wheelbase (ft / m) | 15 / 4.57 | 12.50 / 3.81 | 14.50 / 4.42 | 14.50 / 4.42 |
Engine Wheelbase (ft / m) | 37.17 / 11.33 | 33.33 / 10.16 | 34.25 / 10.44 | 34.25 / 10.44 |
Ratio of driving wheelbase to overall engine wheelbase | 0.40 | 0.38 | 0.42 | 0.42 |
Overall Wheelbase (engine & tender) (ft / m) | 61.98 / 18.89 | 33.33 / 10.16 | 34.25 | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 44,800 / 20,321 | 38,304 / 17,374 | 43,680 / 19,813 | |
Weight on Drivers (lbs / kg) | 134,400 / 60,963 | 107,020 / 48,547 | 124,544 / 56,492 | |
Engine Weight (lbs / kg) | 217,280 / 98,557 | 174,720 / 79,252 | 195,776 / 88,803 | 196,000 / 88,904 |
Tender Loaded Weight (lbs / kg) | 96,544 / 43,792 | |||
Total Engine and Tender Weight (lbs / kg) | 313,824 / 142,349 | 174,720 / 79,252 | 195,776 / 88,803 | 196,000 / 88,904 |
Tender Water Capacity (gals / ML) | 4950 / 18.75 | 2272 / 8.61 | ||
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.05 / 6 | 4.40 / 4 | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 75 / 37.50 | 59 / 29.50 | 69 / 34.50 | |
Geometry Relating to Tractive Effort | ||||
Driver Diameter (in / mm) | 82 / 2083 | 61.50 / 1562 | 55.25 / 1403 | 55.25 / 1405 |
Boiler Pressure (psi / kPa) | 200 / 13.80 | 175 / 12.10 | 180 / 12.40 | 160 / 11 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 26" / 483x660 (3) | 19" x 26" / 483x660 | 16.5" x 26" / 419x660 (3) | 16.5" x 26" / 419x660 (3) |
Tractive Effort (lbs / kg) | 29,188 / 13239.47 | 22,702 / 10297.47 | 29,403 / 13336.99 | 26,136 / 11855.10 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.60 | 4.71 | 4.24 | |
Heating Ability | ||||
Tubes (number - dia) (in / mm) | 119 - 2.25" / 57 | 225 - 1.75" / 44 | 90 - 2" / 51 | |
Flues (number - dia) (in / mm) | 24 - 5.25" / 133 | 25 - 5.25" / 133 | ||
Flue/Tube length (ft / m) | 21 / 6.40 | 11.33 / 3.45 | ||
Firebox Area (sq ft / m2) | 211 / 19.60 | 141 / 11.80 | 140 / 13.01 | 141 / 13.10 |
Grate Area (sq ft / m2) | 41.50 / 3.86 | 23 / 2.14 | 23 / 2.14 | 23 / 2.14 |
Evaporative Heating Surface (sq ft / m2) | 2422 / 225.01 | 1310 / 120.31 | 1648 / 153.10 | 1049 / 97.49 |
Superheating Surface (sq ft / m2) | 697 / 64.75 | 258 / 23.98 | ||
Combined Heating Surface (sq ft / m2) | 3119 / 289.76 | 1310 / 120.31 | 1648 / 153.10 | 1307 / 121.47 |
Evaporative Heating Surface/Cylinder Volume | 189.25 | 153.54 | 170.75 | 108.68 |
Computations Relating to Power Output (More Information) | ||||
Robert LeMassena's Power Computation | 8300 | 4025 | 4140 | 3680 |
Same as above plus superheater percentage | 10,126 | 4025 | 4140 | 4416 |
Same as above but substitute firebox area for grate area | 51,484 | 24,675 | 25,200 | 27,072 |
Power L1 | 20,823 | 4236 | 4032 | 6222 |
Power MT | 1024.71 | 261.79 | 214.12 |