Caledonian Railway 191 Class

Type and origin
Power type	Steam
Designer	William Pickersgill
Builder	North British Locomotive Company
Serial number	NBL 22955–22962
Build date	December 1922
Total produced	8

Specifications
Configuration:
• Whyte	4-6-0
• UIC	2′C n2
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Driver dia.	5 ft 6 in (1.676 m)
Loco weight	62.75 long tons (63.76 t)^[1]
Tender weight	37.85 long tons (38.46 t)^[1]
Boiler pressure	185 lbf/in² (1.28 MPa)^[1]
Superheater	(none)^[2]
Cylinders	Two, outside
Cylinder size	20 ¹⁄₂ in × 26 in (521 mm × 660 mm)
Valve gear	Walschaerts

Performance figures
Tractive effort	23,555 lbf (104.78 kN)

Career
Operators	Caledonian Railway London, Midland and Scottish Railway
Class	CR: 191
Power class	LMS: 3P
Scrapped	1939-1945
Disposition	All scrapped

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.

Reputation

The locomotives were not completely successful, having a reputation for being short of steam unless skilfully 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.

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All were withdrawn and scrapped between 1939 and 1945, having been displaced by new Black Five 4-6-0s under the LMS's drive for standardisation.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	000000001922-12-01-0000December 1922	14619	000000001940-11-01-0000November 1940
192	NBL 22956	000000001922-12-01-0000December 1922	14620	000000001943-10-01-0000October 1943
193	NBL 22957	000000001922-12-01-0000December 1922	14621	000000001945-12-01-0000December 1945
194	NBL 22958	000000001922-12-01-0000December 1922	14622	000000001943-11-01-0000November 1943
195	NBL 22959	000000001922-12-01-0000December 1922	14623	000000001939-12-01-0000December 1939
196	NBL 22960	000000001922-12-01-0000December 1922	14624	000000001940-02-01-0000February 1940
197	NBL 22961	000000001922-12-01-0000December 1922	14625	000000001939-02-01-0000February 1939
198	NBL 22962	000000001922-12-01-0000December 1922	14626	000000001943-04-01-0000April 1943

References

1 2 3 Atkins 1976, pp. 114–115.
↑ Atkins 1976, p. 59.
↑ Atkins 1976, p. 60.
↑ Atkins 1976, p. 61.

Atkins, C. P. (1976). The Scottish 4-6-0 Classes. Ian Allen, Limited.

Caledonian Railway locomotives
Robert Sinclair (1847–1856)	59 (2-2-2) 96 101 111
Benjamin Connor (1856–1876)	59 (2-4-0) 552 600
George Brittain (1876–1882)	1 130 140 152 179 485 486 670
Dugald Drummond (1882–1890)	66 80 123 124 171 262 264 272 294 323
Hugh Smellie (1890)	Appointed 1 September 1890. Died 19 April 1891
John Lambie (1891–1895)	1 13 19 211 538A
John F. McIntosh (1895–1914)	29 43 49 55 92 139 140 179 184 439 498 611 652 711 721 766 782 812 879 900 903
William Pickersgill (1914–1923)	60 72 113 159 191 300 431 956
Miscellaneous	Highland Railway River Class

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