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Midland classes 690 and 780
Great Britain | 1869 | 26 produced
No. 797 after the rebuild by Johnson
No. 797 after the rebuild by Johnson
Tony Hisgett

From 1869, the Midland Railway had tank locomotives built with two coupled axles and a trailing, two-axle bogie for the London suburban routes. The first six came from Beyer, Peacock & Co. in 1869 and are known as class 690. 20 more came in 1870 from Dübs, which were almost identical in construction and were designated class 780.

No. 781 as built
No. 781 as built
Locomotive Magazine, October 1903

They had a double frame that also served as a water tank. All locomotives initially had a condensing apparatus, which was later mostly removed. Johnson later rebuilt it with a new boiler and cab. In the 1923 grouping, all came to the LMS except for one, which had been retired in 1921. Their decommissioning took place between 1924 and 1935.

General
Built1869-1870
ManufacturerBeyer, Peacock & Co., Dübs & Co.
Axle config0-4-4WT (Forney) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase22 ft 9 in
Fixed wheelbase8 ft
Service weight97,776 lbs
Fuel capacitycoal
Power
Power sourcesteam
Estimated power350 hp (261 kW)
Optimal speed17 mph
Starting effort13,313 lbf
Power Plant
Driver diameter62 in
Boiler pressure140 psi
Expansion typesimple
Cylinderstwo, 17 x 24 in
Boiler
Grate area17 sq ft
Firebox area104 sq ft
Tube heating area993 sq ft
Evaporative heating area1,097 sq ft
Total heating area1,097 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
Matthew Kirtley
condensator
last changed: 04/2023
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