Magyar Allamvasutak 2-4-4-0 Locomotives in Hungary


Class Details by Steve Llanso of Sweat House Media

Class IVe/401 (Locobase 1572)

Data from A[nthony] E[dward] Durrant, The Steam Locomotives of Eastern Europe (Newton Abbot:David & Charles, 1966); and P[eter] M[ichael] Kalla-Bishop, Hungarian Locomotives (NY: Drake Publishers, 1973). See also Gustav Reder (Michael Reynolds, trans), The world of steam locomotives (New York: Putnam, 1974).

These small Mallets replaced 4-6-0s that were outmanned by the heavier passenger trains working the ruling 2.5% grade between Fiume and Karlstadt. Reder notes that they had a top speed of 60 kph (38 mph) and could pull 130-ton trains up the 2.5% grade at 30 kph (18.5 mph). (Kalla-Bishop cites a performance of 260 tons up the same 35 km (22 mile) stretch at 24 kph (15 mph.).

Durrant describes a design that had a wide firebox and piston valves on all four cylinders (unusual for a Mallet compound). Two (003 & 005) were fitted with Brotan boilers. This class wound up on Yugoslavian railways after the 1918 Armistice.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassIVe/401
Locobase ID1572
RailroadMagyar Allamvasutak (MAV)
CountryHungary
Whyte2-4-4-0
Number in Class15
Road Numbers
GaugeStd
Number Built15
BuilderMAVAG
Year1905
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.04 / 1.84
Engine Wheelbase (ft / m)25.30 / 7.71
Ratio of driving wheelbase to overall engine wheelbase 0.24
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,849 / 16,261
Weight on Drivers (lbs / kg)146,272 / 66,348
Engine Weight (lbs / kg)168,671 / 76,508
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)168,671 / 76,508
Tender Water Capacity (gals / ML)3200 / 12.12
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 7.70 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56.70 / 1440
Boiler Pressure (psi / kPa)232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)15.35" x 25.59" / 390x650
Low Pressure Cylinders (dia x stroke) (in / mm)25" x 25.59" / 635x650
Tractive Effort (lbs / kg)30,472 / 13821.88
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.80
Heating Ability
Tubes (number - dia) (in / mm)272 - 2.047" / 52
Flues (number - dia) (in / mm)5 - 5.512" / 140
Flue/Tube length (ft / m)16.40 / 5
Firebox Area (sq ft / m2)146.18 / 13.58
Grate Area (sq ft / m2)38.21 / 3.55
Evaporative Heating Surface (sq ft / m2)2655 / 246.66
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2655 / 246.66
Evaporative Heating Surface/Cylinder Volume484.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8869
Same as above plus superheater percentage8869
Same as above but substitute firebox area for grate area33,928
Power L15108
Power MT307.95

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