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Ub Class
CLASS  Ub    4-6-0


Introduced: 1901 Number in Class: 22

Ub Class Register




1901 Baldwin Ub Class



1919 Brooks Ub Class



1919 Richmond Ub Class


Locomotive Specifications

Builders:
   Baldwin Locomotive Works, Philadelphia, USA (20)
   Brooks Locomotive Works, Dunkirk, New York, USA (1)
   Richmond Locomotive and Machine Works, Virginia, USA (1)

Engine Weight:    
36.3 tons
Tender Weight:    22.0 tons Total Weight:    58.3 tons Adhesive Weight:    
26.6 tons
Length over Buffers:    
49' 2"
Total Wheelbase:    42' 7" Engine Wheelbase:    20' 11" Coupled Wheelbase:    
10' 0"
Tender Wheelbase:    
12' 4"
Driver Wheel Dia.:    49 1/8" Cylinders HP:    
Two - 16" x 20"
Cylinders LP:    
Grate Area:    16.0 sq ft Evaporative Area:    
1324 sq ft
Superheated Area:     Working Pressure:    
200 psig
Tractive Effort:    
16670 lbs f
Coal Capacity:    4.0 tons Oil Capacity:     Water Capacity:    
1660 gals

Remarks:     By 1897 rail traffic had increased in New Zealand to such an extent that the railways were becoming obsolescent. Hence the need for new motive powere. An order for ten 4-6-0s were placed on Baldwin and these became easily the most popular "ten-wheelers" ever owned by the NZR. It is interesting to note that they were equipped with inside Stephenson link motion at a time when Walschearts motion was favoured in New Zealand. In later years the locomotives were fitted with superheaters and two were fitted with piston valves, while retaining the old Stephenson link motion. Two locomotives were delivered after Brooks and Richmond merged with American Locomotive Company (Alco). The Brooks engine, at the time of introduction, was the largest and most powerful "ten-wheeler" in New Zealand. The engine had a distinctive look with its British appearing Belpaire firebox, screw-operated reversing gear, sand boxes instead of a sand dome, and a low slung running board with splashers covering the tops of the driving wheels. The Richmond engine was not particularly successful, being considered a poor steamer. Nevertheless, she lasted for 32 years. 10 from Bladwin 1898, and 10 from Bladwin 1901. Some slight data changes between locos.

Preserved Locomotives
  Hooterville Heritage Trust,    Waitara -     Ub 17,     Brooks #3925/1901   Restoring
  Hooterville Heritage Trust,    Waitara -     Ub 282,     Baldwin #16046/1898   Restoring