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Ba Class 4-8-0
CLASS  Ba     4-8-0


Introduced:    1911 Number in Class:    10

Ba Class Register




Locomotive Specifications

Builder:
  NZR Addington

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' 8"
Coupled Wheelbase:    
12' 4"
Tender Wheelbase:    
12' 8"
Driver Wheel Dia.:    42" 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.

Preserved Locomotive
  Mainline Steam,    Auckland -     Ba 552,     NZR Addington #128/1912   

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