Rebuilding included the fitting of a higher pressure boiler, and also involved replacing Joy valve gear with Stephenson valve gear thus forming the M15R class.
Modifications
Many were fitted with condensing gear for working in the London area. In 1949 seven F5s were fitted with vacuum-controlled regulators, converted from Westinghouse air brake to steam brake, and fitted with push-pull apparatus and trip cock gear for branch line operation.. Five of these locomotives worked trains on the line between Epping and Ongar, two were allocated to Yarmouth for working the Yarmouth-Beccles line. 67218 would later be transferred to Epping in 1955. These seven received British Railway lined-black passenger livery; the rest were unlined-black.
One-hundred-and-eighteen M15s and all thirty-two M15rs, passed into London and North Eastern Railway ownership at the 1923 grouping. The number 7000 was added to the ex-GER fleet. They received the following classifications:
Unrebuilt locomotives: F4.
Rebuilt locomotives: F5.
Numbers 7789 and 7790 were incorrectly classified F6. British Railways reclassified both of them F5 on 22 December 1948.
On 1 January 1923 the majority of the class were allocated to Stratford Engine Shed and were employed on suburban traffic in East London on the lines out of Fenchurch Street and Liverpool Street. The table below shows where they were allocated and includes the two examples erroneously allocated as F6 by the LNER:-
Location
F4
F5
F6
Cambridge
1
-
-
Colchester
2
1
-
Ipswich
1
2
-
Lowestoft
2
-
-
Norwich
2
-
-
Parkeston
1
-
-
Stratford
109
27
2
Totals
118
30
2
British Railways
Thirty-seven F4s and all of the F5s, including 7218 and 7219, passed into British Railways ownership in 1948. Their BR numbers were:
Class F4: 67151-67187..
Class F5: 67188-67219
Withdrawal
Ten of the original series of forty engines constructed between 1884-87 were withdrawn in Great Eastern days, between September 1913 and December 1922. F4 withdrawals continued until 1937, and then again from 1943 to June 1956 when the last one, number 67157, was withdrawn from Kittybrewster. The F5 class remained intact until 1955 but withdrawal then proceeded rapidly, and they finally became extinct in May 1958.
Preservation
None of the F4s or F5s survived into preservation. However, a project to build a working replica of F5 number 789 was launched in the early 2000s. The project is based at Tyseley for erection and construction work. The completed locomotive is to be outshopped as No.789 in Great Eastern Railway blue livery.
