Great North of Scotland 0-4-2 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class X / Z4 (Locobase 5898)

Data from Richard Marsden's LNER site -- [] (15 Feb 2004). After the Y class (Locobase 5897) proved too heavy by 2 tons for the Aberdeen Dock service for which they had been bought, the GNSR bought another, scaled-down pair that easily filled the bill. The specs show them to have had the same ratios as the Ys, except for a lower factor of adhesion.

Like the Y5s, these locomotives spent their GNSR / LNER / BR years on the docks, although they too would be leased to private owners from time to time. When British Rail gave them their final set of numbers, the Z4s were numbered in sequence with the Z5s and retired about the same time. 68191 (117 / 43 / 6844 / 8191) left in 1959, while 68190 (116 / 44 / 6843 / 8190) retired a year later.


Class Y / Z5 (Locobase 5897)

Data from Richard Marsden's LNER site -- [] (15 Feb 2004). See also "New Tank Locomotives, Great North of Scotland Ry." Locomotive Magazine, Volume XXI [21] (15 December 1915), p. 266.

Ordered for the Aberdeen Docks, these waggon-bashers weighed in at 2 tons over specifications, which prompted an order for the pair later known as Z4 (see Locobase 5898). At some later point, the weight limitation was overcome and the Z5s worked happily next to the Z4s for decades. Numbered 68193, the original 117 (32 / 6832 / 8193) left service in 1956; 68192 (116 / 30 / 6830 / 8192) retired in 1960.

Marsden notes that these locomotives would be let to private owners and occasionally even worked local goods trains (on the main line?).

Principal Dimensions by Steve Llanso of Sweat House Media

ClassX / Z4Y / Z5
Locobase ID5898 5897
RailroadGreat North of ScotlandGreat North of Scotland
CountryGreat BritainGreat Britain
Whyte0-4-2T0-4-2T
Number in Class22
Road Numbers116-117 /43-44116-117 /30, 32
GaugeStdStd
Number Built22
BuilderManning WardleManning Wardle
Year19151915
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.25 / 1.90
Engine Wheelbase (ft / m)11.08 / 3.3812.75 / 3.89
Ratio of driving wheelbase to overall engine wheelbase 0.49
Overall Wheelbase (engine & tender) (ft / m)12.75 / 3.89
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)51,184 / 23,21762,916 / 28,538
Engine Weight (lbs / kg)51,184 / 23,21762,916 / 28,538
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)51,184 / 23,21762,916 / 28,538
Tender Water Capacity (gals / ML)480 / 1.82540 / 2.05
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.10 / 1 1.10 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.5052 / 26
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 106748 / 1219
Boiler Pressure (psi / kPa)150 / 10.30150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)13" x 20" / 330x50814" x 20" / 356x508
Tractive Effort (lbs / kg)10,261 / 4654.3210,413 / 4723.26
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.99 6.04
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)48 / 4.4654 / 5.02
Grate Area (sq ft / m2) 7.88 / 0.73 9.27 / 0.86
Evaporative Heating Surface (sq ft / m2)498 / 46.28600 / 55.74
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)498 / 46.28600 / 55.74
Evaporative Heating Surface/Cylinder Volume162.08168.38
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11821391
Same as above plus superheater percentage11821391
Same as above but substitute firebox area for grate area72008100
Power L125222930
Power MT217.26205.34

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