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Hungarian State Railways series IIIu
later series 324, Czechoslovak State Railways class 344.4, Polish State Railways Ol 103, Yugoslav Railway class 22 and Italian State Railway class 683
go back
| 1909
895 produced
Image of locomotive
Locomotive Magazine, January 1927

The MÁV series IIIu is among the most successful 2-6-2 tender locomotives. Despite a driver diameter of only 1,440 mm and a top speed of 75 km/h, it was also used in express service. Production started at MÁVAG in 1909 and the first 355 locomotives were built as saturated two-cylinder compounds with a boiler pressure of 15 bars.

540 more were built as superheated simples with a pressure of only 12 bars. The 397 last of them had received a Brotan firebox due to World War I. Additionally, the 95 last of these also had a feedwater heater and cleaner of the Pecz-Rejtő system. After World War I, many came to Czechoslovakia, Yugoslavia, Poland and Italy. After World War II, one each even had been operated in Western and Eastern Germany.

Variantcompoundsuperheated
General
Built1909-1923
ManufacturerMÁVAG
Axle config2-6-2 (Prairie) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length57 ft 6 5/16 in
Length loco36 ft 0 1/16 in
Wheelbase27 ft 3 3/16 in
Rigid wheelbase11 ft 5 13/16 in
Total wheelbase46 ft 8 7/16 in
Empty weight114,001 lbs118,829 lbs
Service weight128,044 lbs132,520 lbs
Adhesive weight91,944 lbs93,189 lbs
Axle load30,666 lbs31,063 lbs
Fuel capacitycoal
Boiler
Grate area33.9 sq ft
Firebox area118.4 sq ft121 sq ft
Tube heating area2,180.8 sq ft1,726.2 sq ft
Evaporative heating area2,299.2 sq ft1,847.2 sq ft
Superheater area395 sq ft
Total heating area2,299.2 sq ft2,242.2 sq ft
Variantcompoundsuperheated
Power Plant
Driver diameter56.7 in
Boiler pressure218 psi174 psi
Expansion typecompoundsimple
Cylinderstwo, HP: 18 1/8 x 25 9/16 in
and LP: 27 3/16 x 25 9/16 in		two, 20 1/16 x 25 9/16 in
Power
Power sourcesteam
Estimated power1,046 hp (780 kW)1,100 hp (820 kW)
Starting effort18,957 lbf26,916 lbf
with start valve22,748 lbf
Calculated Values
Optimal speed35 mph26 mph
steam locomotive
passenger
freight
last changed: 05/2025
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