GER CLASS L77

The Great Eastern Railway (GER) 'Class L77', LNER 'Class N7', is a class of 0-6-2T steam locomotives.

Contents

Overview

Sub-classes

Dimensions

Preservation

External links

Overview

They were designed by Alfred John Hill of the GER and introduced in 1914. The design was perpetuated by Nigel Gresley of the LNER after the 1923 grouping.
Some were fitted with condensing apparatus for working on the Metropolitan Line and the East London Line but the condensing apparatus was removed between 1935 and 1938.
British Railways numbers were '69600-69733'.

Sub-classes

★ N7 Introduced 1914, GER Class L77 with Belpaire firebox

★ N7/1 Introduced 1925, LNER development of GER design with Belpaire firebox

★ N7/2 Introduced 1926, LNER locos with Belpaire firebox and long-travel valves

★ N7/3(1)Introduced 1927, LNER locos with round-top firebox

★ N7/3(2)Introduced 1943, rebuild of N7/1 with round-top firebox

★ N7/3(3)Introduced 1943, rebuild of N7/2 with round-top firebox

★ N7/4 Introduced 1940, GER locos rebuilt with round-top firebox

Dimensions

★ BR Power classification, 3MT

★ Locomotive weight: from 61 tons 16 cwt to 64 tons 17 cwt

★ Boiler pressure, 180 psi

★ Superheater, Yes

★ Cylinders, 18"x24"

★ Driving wheel diameter, 4' 10"

★ Tractive effort, 20,515 lb

★ Valve gear, Walschaerts (piston valves)

Preservation

One, No. 7999 (BR No. 69621) has been preserved on the North Norfolk Railway.

External links

★ LNER encyclopedia

★ Railuk database for N7, N7/1 N7/2 N7/3 N7/4 and N7/5

★ Preserved locomotive datbase entry for 69621