Emperor Ferdinand Northern Railway VIIIa and VIIIb, later IVc
Theiss Railway IIe and IIf, later 253 and 254
In 1856 and 1857, the KFNB got 24 2-4-0 freight locomotives from the StEG factory which got the names “Sphinx” to “Pilades”. They had outside cylinders and driving wheels of 1,264 mm (4 ft 1 3/4 in). In the new scheme of 1869, they became series VIIIa and VIIIb, before this they had already gotten new boilers. In 1881, they became series IVc and were retired between 1890 and 1900.
Between 1857 and 1859, the Tisza Railway (TVV) in today's Hungary got 35 identical locomotives with the names “Branyicska” to “Várda”. When the TVV was nationalized in 1880, the MÁV made them the series IIe and IIf. In 1911, some where still in service and became series 253 and 254. From then on, it took only four more years for the last ones to be retired.
Technical data
General
| Property | as built | new boiler |
|---|---|---|
| Built | 1856-1859 | 1869 |
| Manufacturers | StEG | |
| Wheel arrangement | 2-4-0 (Porter) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | as built | new boiler |
|---|---|---|
| Length | 13.90 m | |
| Length loco | 8.17 m | |
| Wheelbase | 3.53 m | |
| Empty mass | 26.7 t | |
| Service mass | 29 t | 26.7 t |
| Adhesion mass | 20.2 t | |
| Total mass | 52.1 t | |
| Rigid wheelbase | 3.53 m | |
| Water capacity | 7,900 l | |
| Fuel capacity | 4.2 t (coal) | |
Boiler
| Property | as built | new boiler |
|---|---|---|
| Firebox surface | 6.6 m² | 7.5 m² |
| Evaporative heating surface | 121.9 m² | |
| Total heating surface | 121.9 m² | |
| Grate area | 1.5 m² | |
| Tube heating surface | 114.4 m² | |
Power plant
| Property | as built | new boiler |
|---|---|---|
| Driver diameter | 1,264 mm | |
| Boiler pressure | 5.4 bar | 6.5 bar |
| Expansion type | simple expansion | |
| Cylinders | two, 421 x 632 mm | |
Power
| Property | as built | new boiler |
|---|---|---|
| Power source | steam | |
| Estimated power | 150 kW (204 PS) | 220 kW (299 PS) |
| Starting effort | 40.7 kN | 49.0 kN |
Calculated values
| Property | as built | new boiler |
|---|---|---|
| Factor of adhesion | 1 : 4.87 | 1 : 4.05 |
| Optimal speed | 23 km/h | 27 km/h |
| Power-to-weight ratio | 5.2 kW/t | 8.2 kW/t |
| Adhesive weight/Total | 1 : 1.44 | 1 : 1.32 |
| Tractive force/Heating surface | 1 : 6.97 | 1 : 8.39 |
| Heating Surface Equivalent | 159.4 m² | |
| Cylinder volume/HSE | 1 : 1,103.86 | |
| Grate area/Heating surface | 1 : 81.27 | |
| Firebox/Tube surface | 1 : 15.25 |
