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New Zealand Railways class U[h]A[/h]
![U[h]A[/h] 172 with raised running boards at Invercargill](/data/photosTN/NZR_Ua.jpg)
During a severe power shortage in the years before the turn of the century, the NZR ordered locomotives from abroad which could not be produced locally. For passenger service, six 4-6-0 class U[h]A[/h] locomotives wer...
| New Zealand Railways class U[h]A[/h]Remove | |
|---|---|
| Variant | Standard |
| Built | 1899 |
| Manufacturers | Sharp, Stewart & Co. |
| Wheel arrangement | 2C |
| Gauge | 1067 mm |
| Length | 15011 mm |
| Service mass | 38813 kg |
| Top speed | 80 km/h |
| Power | |
| Engine |
General
| Property | New Zealand Railways class U[h]A[/h] Standard Remove |
|---|---|
| Built | 1899 |
| Manufacturers | Sharp, Stewart & Co. |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways class U[h]A[/h] Standard Remove |
|---|---|
| Length | 15.01 m |
| Wheelbase | 6.40 m |
| Total wheelbase | 12.88 m |
| Service mass | 38.8 t |
| Adhesion mass | 27.5 t |
| Total mass | 63.2 t |
| Rigid wheelbase | 3.05 m |
| Water capacity | 7,730 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | New Zealand Railways class U[h]A[/h] Standard Remove |
|---|---|
| Grate area | 1.486 m² |
| Evaporative heating surface | 90.302 m² |
| Total heating surface | 90.3 m² |
Power plant
| Property | New Zealand Railways class U[h]A[/h] Standard Remove |
|---|---|
| Driver diameter | 1,248 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 406 x 508 mm |
Power
| Property | New Zealand Railways class U[h]A[/h] Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 391 kW (532 PS) |
| Top speed | 80 km/h |
| Starting effort | 69.0 kN |
Calculated values
| Property | New Zealand Railways class U[h]A[/h] Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.92 |
| Optimal speed | 35 km/h |
| Power-to-weight ratio | 10.1 kW/t |
| Adhesive weight/Total | 1 : 1.41 |
| Tractive force/Heating surface | 1 : 15.95 |
| Grate area/Heating surface | 1 : 60.77 |
