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CR/LMS McIntosh "721" Class 4-4-0 - 'Dunalastair I'


Class Types
CR Class 721
(Also known as) Dunalastair I

General
Designer John McIntosh
Introduced 1896
Pre-Grouping Company Caledonian Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-4-0
Number Built as 721 15
Manufacturers
ManufacturerTotal
St. Rollox Works 15
Orders
BuilderSponsorOrder #DateSize
St. Rollox Works  Y44 1896 15
Historical Data Development of Lambie 13 class. Larger bogie tenders used after 1897, 4,125 gallons. Cylinders redesigned in 11/1904.

Power
Tractive Effort 15,100lbs
Inside Cylinders 18.25" x 26" (2 off)
Inside Valves Slide
Inside Motion Stephenson

Wheels
Pony 3' 6"
Drivers 6' 6"
Locomotive Wheelbase 22' 1"
Descriptive Wheelbase 6' 6" + 6' 7" + 9' 0" = 22' 1" (engine only)

Dimensions
Weight (loco only) 46t 9cwt
Water Capacity 3,750gal

Boiler & Firebox