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Ua Class
CLASS  Ua    4-6-0

Introduced: 1899 Number in Class: 6

Ua Class Register

Locomotive Specifications

  Sharp Stewart & Co. Ltd., Glasgow, Scotland

Engine Weight:    
38.2 tons
Tender Weight:    
24.0 tons
Total Weight:    62.2 tons Adhesive Weight:    
27.1 tons
Length over Buffers:    
49' 3"
Total Wheelbase:    42' 3" Engine Wheelbase:    21' 0" Coupled Wheelbase:    
10' 0"
Tender Wheelbase:    
13' 0"
Driver Wheel Dia.:    49 1/8" Cylinders HP:    
Two - 16" x 20"
Cylinders LP:    
Grate Area:    16.0 sq ft Evaporative Area:    
972 sq ft
Superheated Area:     Working Pressure:    
175 psig
Tractive Effort:    
14591 lbs f
Coal Capacity:    4.0 tons Oil Capacity:     Water Capacity:    
1700 gals

Remarks:     With the increase in rail traffic in 1897, the demand for additional locomotives became absolutely necessary. An order was placed on Sharp, Stewart for six passenger engines, these being similar to the Addington 'U' class but with smaller coupled wheels. They had low-set running boards with splashers over the tops of the drivering wheels, a characteristic two-window cab, and at first, no sand dome, the sand being carried in boxes mounted on the running boards. Unfortunately they did not steam well and their tender axleboxes tended to run hot. But they did run express trains north and south of Dunedin for many years.