Hungarian State Railways class 601
Czechoslovak State Railways class 636.0 and Yugoslav Railway class 32
Since the MÁV had already had good experiences with the Mallets of the type VIm (or class 651), even more powerful Mallets were built as class 601 from 1914 onwards. Thanks to an additional leading axle, they now had the wheel arrangement 2-6-6-0 and were considered the most powerful steam locomotives in Europe at the time. Their job was now to pull freight trains across the Croatian Karst without helper locomotives.
The 57 locomotives built were split among Yugoslavia, Romania and Czechoslovakia after the First World War. Due to an outstanding order, the MÁV received three more in 1920. The Oriental Railway also ordered three identical locomotives in 1918, bringing the total to 63. All operators retired their locomotives in the forties and fifties.
Technical data
General
| Property | early batches | late batches |
|---|---|---|
| Built | 1914-1920 | |
| Manufacturers | MÁVAG | |
| Wheel arrangement | 2-6-6-0 | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | early batches | late batches |
|---|---|---|
| Length | 22.57 m | |
| Length loco | 14.57 m | |
| Wheelbase | 11.90 m | |
| Empty mass | 99.8 t | |
| Service mass | 106.5 t | 109.4 t |
| Adhesion mass | 96.7 t | 96.9 t |
| Total mass | 163.3 t | 162.5 t |
| Rigid wheelbase | 1.70 m | |
| Axle load | 15.8 t | 16.4 t |
| Water capacity | 23,000 l | |
| Fuel capacity | 8 t (coal) | |
Boiler
| Property | early batches | late batches |
|---|---|---|
| Grate area | 5.09 m² | 5.24 m² |
| Firebox surface | 23 m² | 25.7 m² |
| Tube heating surface | 252 m² | 221 m² |
| Evaporative heating surface | 275 m² | 246.7 m² |
| Superheater surface | 66 m² | 87.3 m² |
| Total heating surface | 341.0 m² | 334.0 m² |
Power plant
| Property | early batches | late batches |
|---|---|---|
| Driver diameter | 1,440 mm | |
| Boiler pressure | 15 bar | |
| Expansion type | compound | |
| Cylinders | four, HP: 520 x 660 mm and LP: 850 x 660 mm | |
Power
| Property | early batches | late batches |
|---|---|---|
| Power source | steam | |
| Indicated power | 1,736 kW (2,360 PS) | |
| Top speed | 60 km/h | |
| Starting effort | 230.0 kN | |
| Starting effort simple | 276.0 kN | |
Calculated values
| Property | early batches | late batches |
|---|---|---|
| Factor of adhesion | 1 : 4.12 | 1 : 4.13 |
| Optimal speed | 47 km/h | |
| Power-to-weight ratio | 16.3 kW/t | 15.9 kW/t |
| Heating Surface Equivalent | 522.0 m² | 549.8 m² |
| Cylinder volume/HSE | 1 : 1,254.50 | 1 : 1,191.07 |
| Adhesive weight/Total | 1 : 1.10 | 1 : 1.13 |
| Tractive force/Heating surface | 1 : 14.08 | 1 : 14.38 |
| Grate area/Heating surface | 1 : 66.99 | 1 : 63.74 |
| Firebox/Tube surface | 1 : 10.96 | 1 : 8.60 |
| Total/Superheater | 1 : 4.17 | 1 : 2.83 |
