Wab794 – Technical Information
| Makers No: | 251 | |
| Built: | 1927 by New Zealand Government Railway Workshops at Hillside, Dunedin, NZ. | |
| Configuration: | 4-6-4 T (Tank) | |
| Gauge: | 3ft 6in | (1067mm) |
| Cylinders: | Two | |
| Bore and Stroke: | 17 x 26 inches | (431.8 x 660.4mm) |
| Axle loading: | 14.3 tons | (14.53 tonnes) |
| Driving Wheels: | 4ft 6in (54 inches) | (1371.6mm) |
| Heating Surface: | 1050 sq feet | (97.55 metres) |
| Superheater: | 183 sq feet | (17 metres) |
| Steam Pressure: | 200 psi max | (1380 kPa) |
| Grate Area: | 33 sq feet | (3.07 sq metres) |
| Coal Load: | 3 tons | (3.05 tonnes) |
| Water Load: | 1700 gallons | (7728.3 litres) |
| Tractive Effort: | 22,250 lbs | (10,092 kilograms) |
| Valve Gear Type: | Walschaert | |
| Weight: | 74 tons | (75.19 tonnes) |
| Adhesive Weight: | 41.85 tons | (42.52 tonnes) |
| Length: | 44ft 5¾in | (13.56 metres) |
| Operating Speed: | 43 ½ mph | (70km/h) |
| Approx Power: | 1000bhp max (under ideal operating conditions) |
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