Southern Railway N Class
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The Southern Railway (SR) N Class were 2-6-0 (mogul) steam locomotives designed by Richard Maunsell for mixed-traffic. The first 65 were built with the standard right hand drive.
These locomotives were introduced by the South Eastern and Chatham Railway in 1917. A three-cylinder version, N1 Class, was introduced in 1922.
Both classes were taken over by the Southern Railway in 1923 and by British Railways in 1948. Their BR numbers were 31400-31880.
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[edit] N Class Dimensions
- Tender locomotive
- BR Power classification, 4P5F
- Locomotive weight, 61 tons 4 cwt, Tender weight, not known
- Boiler pressure, 200 psi
- Superheater, Yes
- Cylinders, 19"x28"
- Driving wheel diameter, 5' 6"
- Tractive effort, 26,035 lb
- Valve gear, Walschaerts
Number 1850 was fitted experimentally with J. T. Marshall valve gear in 1933-34 but soon reverted to standard Walschaerts gear.
[edit] N1 Class Dimensions
- Tender locomotive
- BR Power classification, 4P5F
- Locomotive weight, 64 tons 5 cwt, Tender weight, not known
- Boiler pressure, 200 psi
- Superheater, Yes
- Cylinders, (3) 16"x28"
- Driving wheel diameter, 5' 6"
- Tractive effort, 27,695 lb
- Valve gear, Walschaerts
As built, the N1 class was fitted with Gresley conjugated valve gear but this was later replaced with three sets of valve gear.
[edit] Sources
Ian Allan ABC of British Railways Locomotives, winter 1962/3 edition
