The NER Class F (
LNER LNER may refer to:
* London and North Eastern Railway, a railway company in the United Kingdom from 1923 until 1947
* London North Eastern Railway, a train operating company in the United Kingdom since 2018
* Liquid neutral earthing resistor, a typ ...
Class D22) was a class of
4-4-0 steam locomotives of the
North Eastern Railway. It was designed by
Thomas William Worsdell
Thomas William Worsdell (14 January 1838 – 28 June 1916) was an English locomotive engineer. He was born in Liverpool into a Quaker family.
Family
T. W. Worsdell – normally known as William – was the eldest son of Nathaniel Worsdell (180 ...
and introduced in 1887.
History
Class F (
compound expansion) and Class F1 (
simple expansion
A compound engine is an engine that has more than one stage for recovering energy from the same working fluid, with the exhaust from the first stage passing through the second stage, and in some cases then on to another subsequent stage or even st ...
) 4-4-0s were developments of T.W. Worsdell's experimental
Class D 2-4-0
Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels.
The notation 2-4-0T indi ...
. The Class Ds were two-cylinder compounds of the
von Borries type. However, the 2-4-0 wheel arrangement was found unsuitable and this led to the development of the Class F 4-4-0.
Between 1896 and 1911 all the Class D, F and F1 locomotives were rebuilt into one 4-4-0 class with 18in x 24in simple expansion cylinders,
piston valves
Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive. They control the admission of steam into the cylinders and its subsequent exhausting, enabling a locomotive to move under its own power ...
, and
Stephenson valve gear
The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for various kinds of steam engines. It is named after Robert Stephenson but was invented by his employees.
...
. They had been built with
slide valves and
Joy valve gear. The combined class was designated "Class F" from 1914.
Superheaters were fitted between 1913 and 1920.
Dimensions
The information box (above right) shows the dimensions after 1911. Before this, dimensions varied:
* Boiler pressure: 140, 160 or 175 psi
* Cylinders (compound): one and one
* Cylinders (simple): two
Use
They were initially used for express passenger services. Between 1892 and 1894 they were displaced by newer locomotives and relegated to secondary duties. By the time of the 1923
Grouping
Grouping may refer to:
* Muenchian grouping
* Principles of grouping
* Railways Act 1921, also known as Grouping Act, a reorganisation of the British railway system
* Grouping (firearms), the pattern of multiple shots from a sidearm
See also ...
, they had been further relegated and were typically used for branch line stopping trains.
Withdrawal
They were withdrawn between 1927 and 1935 and none were preserved.
References
{{LNER Locomotives
4-4-0 locomotives
F
Railway locomotives introduced in 1887
Scrapped locomotives
Standard gauge steam locomotives of Great Britain
Passenger locomotives