Introduced: 1911
Number in Class: 10
Locomotive Specifications
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| Engine Weight: 43.9 tons |
Tender Weight: 25.5 tons |
Total Weight: 69.4 tons | Adhesive Weight: 32.3 tons |
| Length over Buffers: 52' 3" |
Total Wheelbase: 44' 10" | Engine Wheelbase: 22' 8½" |
Coupled Wheelbase: 12' 4" |
| Tender Wheelbase: 12' 8" |
Driver Wheel Dia.: 42½" | Cylinders HP: Two - 16" x 22" |
Cylinders LP: |
| Grate Area: 16.7 sq ft | Evaporative Area: 788 sq ft |
Superheated Area: 206 sq ft |
Working Pressure: 175 psig |
| Tractive Effort: 18550 lbs f |
Coal Capacity: 4.0 tons | Oil Capacity: | Water Capacity: 1700 gals |
| Remarks: Essentially similar to the 'B' class, the 'Ba' had some differences with superheated boilers and slightly smaller fireboxes. A massive vee-shaped headstock was originally fitted, perhaps to deflect snowdrifts in inland Otago and Southland. Intended primarily for the haulage of heavy freight trains at speeds up to 30 m.p.h., but like other Dunedin locomotives, took their turn on passenger trains. All but two were ultimately fitted with tender cabs and placed into shunting duties. Five were rebuilt with wide-firebox boilers; two in 1928, and three 1948-1949. |
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