Nord 0-6-4 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class 3021 (Locobase 11276)

Data from Maurice Demoulin, Traite Pratique de la Machine Locomotive (Paris: Libraire Polytechnique, Baudry et Cie, 1898), p. 143. See also Gabriel Bonnin : MTmoires dñun MTcanicien de Route, La Grande Aventure de la Vapeur 1931-1971, archived at [], last accessed 15 January 2017; and "Le materiel roulant du service metropoliain de la Petite Ceinture", presented at [], last accessed 15 January 2017.

MacDonnell's Great Southern & Western Railway in Ireland was the inspiration for this relatively large order of mixed-traffic tanks. Compared to the 0-6-2Ts of the same year (Locobase 11273), this design had taller drivers, a bigger grate, and more cylinder volume. They were rated to pull a 350-ton train up a 0.5% grade at 40 km/h (25 mph).

According to Gabriel Bonnin's memoirs, these were known as Courtes Queues (Locobase translates as "bobtails") because of a particularly small bunker.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11276
Number in Class55
Road Numbers3021-3075
Number Built55
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.45 / 4.10
Engine Wheelbase (ft / m)24.93 / 7.60
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)24.93 / 7.60
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)79,366 / 36,000
Engine Weight (lbs / kg)120,372 / 54,600
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)120,372 / 54,600
Tender Water Capacity (gals / ML)1320 / 5
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.80 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)65.50 / 1664
Boiler Pressure (psi / kPa)127.60 / 8.80
High Pressure Cylinders (dia x stroke) (in / mm)17.01" x 24.02" / 432x610
Tractive Effort (lbs / kg)11,508 / 5219.95
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.90
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)25.07 / 2.33
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3199
Same as above plus superheater percentage3199
Same as above but substitute firebox area for grate area
Power L1
Power MT

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