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Hungarian State Railways IIIu
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 19...
General
| Property | Hungarian State Railways IIIu compound |
|---|---|
| Built | 1909-1923 |
| Manufacturers | MÁVAG |
| Wheel arrangement | 2-6-2 (Prairie) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Hungarian State Railways IIIu compound |
|---|---|
| Length | 17.53 m |
| Length loco | 10.97 m |
| Wheelbase | 8.31 m |
| Rigid wheelbase | 3.50 m |
| Total wheelbase | 14.24 m |
| Empty weight | 51.7 t |
| Service weight | 58.1 t |
| Adhesive weight | 41.7 t |
| Axle load | 13.9 t |
Boiler
| Property | Hungarian State Railways IIIu compound |
|---|---|
| Grate area | 3.148 m² |
| Firebox surface | 11 m² |
| Tube heating surface | 202.6 m² |
| Evaporative heating surface | 213.6 m² |
| Total heating surface | 213.6 m² |
Power plant
| Property | Hungarian State Railways IIIu compound |
|---|---|
| Driver diameter | 1,440 mm |
| Boiler pressure | 15 bar |
| Expansion type | compound |
| Cylinders | two, HP: 460 x 650 mm and LP: 690 x 650 mm |
Power
| Property | Hungarian State Railways IIIu compound |
|---|---|
| Power source | steam |
| Estimated power | 780 kW (1,061 PS) |
| Starting effort | 84.3 kN |
| Starting effort simple | 101.2 kN |
Calculated values
| Property | Hungarian State Railways IIIu compound |
|---|---|
| Factor of adhesion | 1 : 4.85 |
| Optimal speed | 56 km/h |
| Power-to-weight ratio | 13.4 kW/t |
| Heating Surface Equivalent | 268.6 m² |
| Cylinder volume/HSE | 1 : 854.62 |
| Adhesive weight/Total | 1 : 1.39 |
| Tractive force/Heating surface | 1 : 8.24 |
| Grate area/Heating surface | 1 : 67.85 |
| Firebox/Tube surface | 1 : 18.42 |
