Victorian Railways class NA
Australia 1898 17 produced
Baldwin supplied two 2-6-2T two and a half foot gauge tank locomotives to the Victorian Railways in 1898. The VR workshops in assembled two more from the spare parts supplied. Further production locomotives brought the number to 17. Two locomotives had received a four-cylinder compound engine of the Vauclain type, the rest had a two-cylinder simple engine. The first locomotive was scrapped in 1929 due to wear, most were retired between 1945 and 1960. Today there are six machines on the Puffing Billy Railway, five of which are operational.
Technical data
General
| Property | simple | compound |
|---|---|---|
| Built | 1898-1915 | |
| Manufacturers | Baldwin, Newport | Baldwin |
| Wheel arrangement | 2-6-2T (Prairie) | |
| Gauge | 762 mm (Two feet six inch) | |
Dimensions and weights
| Property | simple | compound |
|---|---|---|
| Length | 9.40 m | |
| Wheelbase | 6.66 m | |
| Service mass | 34.8 t | 35.5 t |
| Adhesion mass | 25.9 t | 26.4 t |
| Rigid wheelbase | 2.44 m | |
| Axle load | 9.6 t | 9.4 t |
| Water capacity | 2,953 l | |
| Fuel capacity | 1.5 t (coal) | |
Boiler
| Property | simple | compound |
|---|---|---|
| Grate area | 0.841 m² | 0.839 m² |
| Firebox surface | 4.366 m² | 4.088 m² |
| Tube heating surface | 44.315 m² | 44.594 m² |
| Evaporative heating surface | 48.681 m² | |
| Total heating surface | 48.7 m² | |
Power plant
| Property | simple | compound |
|---|---|---|
| Driver diameter | 914 mm | |
| Boiler pressure | 12.4 bar | |
| Expansion type | simple expansion | compound |
| Cylinders | two, 330 x 457 mm | four, HP: 229 x 457 mm and LP: 381 x 457 mm |
Power
| Property | simple | compound |
|---|---|---|
| Power source | steam | |
| Estimated power | 186 kW (253 PS) | |
| Starting effort | 57.5 kN | 40.5 kN |
| Starting effort simple | 48.6 kN | |
Calculated values
| Property | simple | compound |
|---|---|---|
| Factor of adhesion | 1 : 4.43 | 1 : 6.38 |
| Optimal speed | 19 km/h | 27 km/h |
| Power-to-weight ratio | 5.3 kW/t | 5.2 kW/t |
| Heating Surface Equivalent | 70.5 m² | 69.1 m² |
| Cylinder volume/HSE | 1 : 1,110.51 | 1 : 1,297.05 |
| Adhesive weight/Total | 1 : 1.34 | |
| Tractive force/Heating surface | 1 : 24.67 | 1 : 17.39 |
| Grate area/Heating surface | 1 : 57.88 | 1 : 58.02 |
| Firebox/Tube surface | 1 : 10.15 | 1 : 10.91 |
