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Record: 71951 (21/04/2026)
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CR/LMS McIntosh "900" Class 4-4-0 - 'Dunalastair III'


Class Types
CR Class 900
CR Class 900 Super
(Also known as) Dunalastair III

General
Designer John McIntosh
Introduced 1899
Pre-Grouping Company Caledonian Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-4-0
Number Built as 900 16
Manufacturers
ManufacturerTotal
St. Rollox Works 16
Orders
BuilderSponsorOrder #DateSize
St. Rollox Works  Y57 1899 3
St. Rollox Works  Y62 1900 13

Power
900 900 Super
Miscellaneous Differences   Superheated
Tractive Effort 18,411lbs 18,315lbs
Inside Cylinders 19" x 26" (2 off) 19.5" x 26" (2 off)
Inside Valves Slide Slide
Inside Motion Stephenson Stephenson

Wheels
900 900 Super
Pony 3' 6"
As 900
Drivers 6' 6"
As 900
Locomotive Wheelbase 23' 7"
As 900
Descriptive Wheelbase 6' 6" + 7' 7" + 9' 6" = 23' 7" (engine only)
As 900

Dimensions
900 900 Super
Weight (loco only) 51t 14cwt 54t 10cwt
Water Capacity 4,125gal
As 900

Boiler & Firebox
900 900 Super
Boiler Pitch 8'
As 900