Caledonian Railway 191 Class

The Caledonian Railway 191 Class were 4-6-0 passenger engines designed by William Pickersgill and built in 1922 by the North British Locomotive Company. The class was intended for use on the Callander and Oban line, to augment the 55 Class 4-6-0s and replace elderly 179 Class 4-4-0s, and they were thus known as the New Oban Bogies, however, they were also used on other Caledonian lines.

Caledonian Railway 191 Class
Type and origin
Power typeSteam
DesignerWilliam Pickersgill
BuilderNorth British Locomotive Company
Serial numberNBL 22955–22962
Build dateDecember 1922
Total produced8
Specifications
Configuration:
​
 • Whyte4-6-0
 • UIC2′C n2
Gauge4 ft 8+1⁄2 in (1,435 mm)
Driver dia.5 ft 6 in (1.676 m)
Loco weight62.75 long tons (63.76 t)[1]
Tender weight37.85 long tons (38.46 t)[1]
Boiler pressure185 lbf/in2 (1.28 MPa)[1]
Superheater(none)[2]
CylindersTwo, outside
Cylinder size20+1⁄2 in × 26 in (521 mm × 660 mm)
Valve gearWalschaerts
Performance figures
Tractive effort23,555 lbf (104.78 kN)
Career
Operators
ClassCR: 191
Power classLMS: 3P
Scrapped1939-1945
DispositionAll scrapped

Reputation

The locomotives were not completely successful, having a reputation for being short of steam unless skillfully fired, and the dubious distinction of the highest total locomotive hammerblow of any locomotive class inherited by the LMS upon its formation in 1923.[3] The lack of superheating was a curious omission from a type introduced as late as 1922. This may not have helped their steaming problems.

Disposal

All were withdrawn and scrapped between 1939 and 1945, having been displaced by new Black Five 4-6-0s under the LMS's drive for standardisation.

Table of locomotives[4]
CR no. Works no. Delivered LMS no. Scrapped
191 NBL 22955 December 1922 14619 November 1940
192 NBL 22956 December 1922 14620 October 1943
193 NBL 22957 December 1922 14621 December 1945
194 NBL 22958 December 1922 14622 November 1943
195 NBL 22959 December 1922 14623 December 1939
196 NBL 22960 December 1922 14624 February 1940
197 NBL 22961 December 1922 14625 February 1939
198 NBL 22962 December 1922 14626 April 1943

References
  1. Atkins 1976, pp. 114–115.
  2. Atkins 1976, p. 59.
  3. Atkins 1976, p. 60.
  4. Atkins 1976, p. 61.
  • Atkins, C. P. (1976). The Scottish 4-6-0 Classes. Ian Allan, Limited.
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