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Caledonian McIntosh 0-4-4T
later classes 92, 104, 879 and 439
Great Britain | 1897 | 102 produced
Side view of No. 97 (class 92)
Side view of No. 97 (class 92)
collection Taylor Rush

The Caledonian Railway had a large number of 0-4-4T tank locomotives built between 1884 and 1925, which were intended for local passenger traffic in Edinburgh and Glasgow. One of four chief engineers who procured these locomotives was John F. McIntosh. During his service, which lasted from 1895 to 1914, twelve members of class 92, twelve of class 104, ten of class 879 and 68 of class 439 were created.

Depending on where the individual classes were to be used, the driving wheel diameter differed significantly with 54 or 69 inches. For the sections laid underground, some locomotives had a condensation device, but this apparently could not always retain all of the steam. Pickersgill introduced the class 431 in 1922, which was based directly on the 439 and was used as a banker locomotive. The LMS also had its own version of the 439 built from 1925 onwards. A large number of McIntosh's 0-4-4Ts also survived into the British Railways era.

Variant92104439
General
Built189718991900-1914
ManufacturerSt. RolloxNeilson & Co.
Axle config0-4-4T (Forney) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase22 ft20 ft 6 in20 ft 9 in
Fixed wheelbase7 ft 6 in5 ft 9 in
Service weight120,510 lbs114,520 lbs133,600 lbs
Adhesive weight72,880 lbs71,680 lbs
Axle load39,280 lbs38,800 lbs
Water capacity1,201 us gal1,441 us gal
Fuel capacitycoal4,480 lbs (coal)coal
Power
Power sourcesteam
Estimated power550 hp (410 kW)400 hp (298 kW)
Optimal speed21 mph13 mph
Starting effort15,566 lbf16,377 lbf19,202 lbf
Power Plant
Driver diameter69 in54 in69 in
Boiler pressure150 psi180 psi
Expansion typesimple
Cylinderstwo, 18 x 26 intwo, 17 x 24 intwo, 18 1/4 x 26 in
Boiler
Grate area17 sq ft13 sq ft
Firebox area110.9 sq ft83 sq ft
Tube heating area975.1 sq ft702 sq ft
Evaporative heating area1,086 sq ft785 sq ft
Total heating area1,086 sq ft785 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
condensator
John Farquharson McIntosh
condensator
last changed: 01/2024
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