Caledonian Railway 721 Class "Dunalastair" For variations see Table 1 below
Type and origin
Power type
Steam
Designer
John F. McIntosh
Builder
St. Rollox Works
Build date
1896
Total produced
15
Specifications
Configuration:
• Whyte
4-4-0
Gauge
4 ft 8+1⁄2 in (1,435 mm)
Driver dia.
6 ft 6 in (1.98 m)
Loco weight
47 long tons (48 t)
Fuel type
coal
Water cap.
4,125 imp gal (18,750 L; 4,954 US gal)
Boiler pressure
160 psi (1,100 kPa)
Cylinders
Two, inside
Cylinder size
18.25 in × 26 in (464 mm × 660 mm)
Valve gear
Stephenson
Valve type
Slide valves
Performance figures
Tractive effort
15,100 lbf (67 kN)
Career
Operators
CR • LMS • British Railways
Class
CR: 721
Power class
LMS: 2P
Withdrawn
1930–48
Disposition
All scrapped
The Caledonian Railway 721 Class (known as the "Dunalastair" class) was a class of 4-4-0 steam locomotives designed by John F. McIntosh for the Caledonian Railway (CR) and introduced in 1896.[1] Taking their name from the estate in Perthshire owned by the
Caledonian’s then deputy chairman, J.C.Bunten, all survived to be absorbed by the London, Midland and Scottish Railway (LMS) in 1923 and a few survived into British Railways (BR) ownership in 1948.
^"Caledonian Railway locomotives". Steamindex.com. Retrieved 20 June 2012.
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