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M Class
CLASS  M    0-6-0 T    2-4-4 T


Introduced: 1888 Number in Class: 4

M Class Register




M class as built 0-6-0 T




M class as rebuilt 2-4-4 T


Locomotive Specifications 0-6-0 T

Builders:
  1.  Hunslet Engine Co., Leeds, England
  2.  Rebuilt by NZR Addington

Engine Weight:    
27.7 tons
Tender Weight:     Total Weight:    27.7 tons Adhesive Weight:    
27.7 tons
Length over Buffers:     Total Wheelbase:    12' 0" Engine Wheelbase:    12' 0" Coupled Wheelbase:    
12' 0"
Tender Wheelbase:     Driver Wheel Dia.:    42" Cylinders HP:    
Two - 13" x 20"
Cylinders LP:    
Grate Area:    8.6 sq ft Evaporative Area:    
583 sq ft
Superheated Area:     Working Pressure:    
130 psig
Tractive Effort:    
8370 lbs f
Coal Capacity:    1.35 tons Oil Capacity:     Water Capacity:    600 gals



Locomotive Specifications 2-4-4 T

Engine Weight:    
31.0 tons
Tender Weight:     Total Weight:    31.0 tons Adhesive Weight:    
15.8 tons
Length over Buffers:    
30' 3"
Total Wheelbase:    
23' 4"
Engine Wheelbase:    
23' 4"
Coupled Wheelbase:    
5' 9"
Tender Wheelbase:     Driver Wheel Dia.:    42" Cylinders HP:    
Two - 12" x 20"
Cylinders LP:    
Grate Area:    8.6 sq ft Evaporative Area:    
583 sq ft
Superheated Area:     Working Pressure:
    
160 psig
Tractive Effort:    
7432 lbs f
Coal Capacity:    1.35 tons Oil Capacity:     Water Capacity:    
600 gals

Remarks:     Originally built by Hunslet for Otago Railways, they were used for service on the Bluff-Invercargill-Winton section. In 1877, two were taken over by NZR and transferred to Christchurch, the other two following in 1879-80. Between 1888 and 1890 they were rebuilt, at the Addington workshops, with 2-4-4 T wheel arrangement and their axle loading decreased from more than 9 tons to less than eight tons. With the adhesive weight reduced from nearly 28 tons to only 15.8 tons, their pulling power was markedly reduced and they were generally used as assisting engines or shunting locomotives until their retirement between 1924 and 1928.