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Record: 71951 (21/04/2026)
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CR/LMS McIntosh "766" Class 4-4-0 - 'Dunalastair II'


Class Types
CR Class 766
CR Class 766 Super
(Also known as) Dunalastair II

General
Designer John McIntosh
Introduced 1897
Pre-Grouping Company Caledonian Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-4-0
Number Built as 766 15
Conversions to other classes 4
Manufacturers
ManufacturerTotal
St. Rollox Works 15
Orders
BuilderSponsorOrder #DateSize
St. Rollox Works  Y51 1897 15
Historical Data Larger version of 721 class.

Power
Larger version of 721 class. 766 Super
Miscellaneous Differences   Superheated
Tractive Effort 17,900lbs 18,315lbs
Inside Cylinders 19" x 26" (2 off) 19.5" x 26" (2 off)
Inside Valves Slide Slide
Inside Motion Stephenson Stephenson

Wheels
Larger version of 721 class. 766 Super
Pony 3' 6"
As Larger version of 721 class.
Drivers 6' 6"
As Larger version of 721 class.
Locomotive Wheelbase 23' 1"
As Larger version of 721 class.
Descriptive Wheelbase 6' 6" + 7' 7" + 9' 0" = 23' 1" (engine only)
As Larger version of 721 class.

Dimensions
Larger version of 721 class. 766 Super
Weight (loco only) 49t 0cwt 52t 0cwt
Water Capacity 4,125gal
As Larger version of 721 class.

Boiler & Firebox
Larger version of 721 class. 766 Super
Boiler Pitch 7' 9" 8'