Hungarian State Railways TV
Hungarian State Railways class 375 and Czechoslovak State Railways class 331.0
The TV was a 2-6-2T tank locomotive intended for branch line service. Between 1907 and 1923, MÁVAG built a total of 596 which had some differences depending on construction year. Most locomotives built between 1908 and 1913 were saturated two-cylinder compounds, while production of a superheated simple started in 1911. The saturated locomotives had an axle load of only 10.3 tonnes, while the superheated ones had an axle load of nearly 11 tonnes.
In addition to the locomotives of the MÁV, more were built for state, private and military railways in Hungary, Czechoslovakia, Romania and Yugoslavia. They had a top speed of 60 km/h and were designated class 375 in the later scheme. Additionally, the MÁV ordered the TVa, later class 376, that had smaller drivers for a top speed of 50 km/h.
After World War I, the ČSD received 58 of these locomotives and designated them class 331.0. They were only used on the Slovak part and many of the saturated compound locomotives received a superheater. Today, some are preserved in different countries. The only operational one is ČSD 331.037 that can be found at Bratislava-Vychod.
Technical data
General
| Property | compound | superheated simple |
|---|---|---|
| Built | 1908-1913 | 1911-1923 |
| Manufacturers | MÁVAG | |
| Wheel arrangement | 2-6-2T (Prairie) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | compound | superheated simple |
|---|---|---|
| Length | 11.10 m | |
| Empty mass | 37.7 t | 40.1 t |
| Service mass | 51.2 t | 52.8 t |
| Adhesion mass | 30.8 t | 32.5 t |
| Axle load | 10.3 t | 10.9 t |
| Water capacity | 5,600 l | |
| Fuel capacity | 3.4 t (coal) | |
Boiler
| Property | compound | superheated simple |
|---|---|---|
| Grate area | 1.83 m² | 1.8 m² |
| Firebox surface | 8.5 m² | 9.1 m² |
| Tube heating surface | 95 m² | 77.1 m² |
| Evaporative heating surface | 103.5 m² | 86.2 m² |
| Total heating surface | 103.5 m² | 108.8 m² |
| Superheater surface | 22.6 m² |
Power plant
| Property | compound | superheated simple |
|---|---|---|
| Driver diameter | 1,180 mm | |
| Boiler pressure | 14 bar | 12 bar |
| Expansion type | compound | simple expansion |
| Cylinders | two, HP: 390 x 600 mm and LP: 590 x 600 mm | two, 410 x 600 mm |
Power
| Property | compound | superheated simple |
|---|---|---|
| Power source | steam | |
| Estimated power | 400 kW (544 PS) | 500 kW (680 PS) |
| Top speed | 60 km/h | |
| Starting effort | 64.0 kN | 87.2 kN |
| Starting effort simple | 76.9 kN | |
Calculated values
| Property | compound | superheated simple |
|---|---|---|
| Factor of adhesion | 1 : 4.71 | 1 : 3.66 |
| Optimal speed | 39 km/h | 35 km/h |
| Power-to-weight ratio | 7.8 kW/t | 9.5 kW/t |
| Heating Surface Equivalent | 146.0 m² | 176.9 m² |
| Cylinder volume/HSE | 1 : 1,052.70 | 1 : 895.59 |
| Adhesive weight/Total | 1 : 1.66 | 1 : 1.62 |
| Tractive force/Heating surface | 1 : 12.92 | 1 : 16.74 |
| Grate area/Heating surface | 1 : 56.56 | 1 : 60.44 |
| Firebox/Tube surface | 1 : 11.18 | 1 : 8.47 |
| Total/Superheater | 1 : 3.81 |
