LT Cabin/Signal Box Codes 1906-2006 Picc/Nor

Following on from the list of Met/District cabin codes, here is a (hopefully) complete list of Northern/Picadilly lines codes. I have included the Northern City Line here as although it was owned by the Met for a period, it has mostly been a branch of the Northern Line.

HAMPSTEAD LINE INCLUDING KENNINGTON EXTENSION
A - Kennington 1926?-37 (recoded B) - what was code pre-1926?
B - Strand 1907-37 (recoded C)
B - Kennington 1937-58 IMR 1958-
C - Strand/Charing Cross 1937-61 IMR 1961-
D - Mornington Crescent 1907-24 (incorporated into Camden Tn E)
E - Camden Town 1907-58 IMR 1955- (Mornington Crescent from 1924)
F - Hampstead 1907-58 IMR 1958-
G - Golders Green 1907-71 IMR 1971-
H - Highgate (Archway) 1907-39 (recoded NN)

CITY & SOUTH LONDON/MORDEN EXTENSION
Note - some of the codes from 1919 are shown in LT paperwork as being dated 1914 but I date these to the normally given introduction of auto signalling on the CSLR.
J - Euston 1919-58 IMR 1958-
K - Angel 1919-59 (siding abolished)
L - Old Street 1919-22
L - Kings Cross (Loop) 1927-58 IMR (on Picc) 1958-
M - Moorgate 1919-61 IMR 1961-
N - Unused
P - London Bridge 1919-62 IMR 1962-
Q - Elephant & Castle?
R - S Unused
T - Clapham Common 1919-61 IMR 1961-
U - Stockwell 1919-62 (siding and crossover removed)
U - Stockwell IMR 1976- (crossover reinstated)
V - Unused
W - Tooting Broadway 1926-59 IMR 1959-
X - Unused
Y - Morden 1926-62 IMR 1962-
Z - Morden Depot GF 1926- (unofficial code)

EDGWARE LINE
AA - Brent 1926-37 (passing loops removed)
AB - Hendon Central 1923-30 (crossovers removed)
AC - Colindale 1924-67 IMR 1967-
AD - Unused
AE - Edgware 1924-65 IMR 1965-

NORTHERN CITY LINE ORIGINAL SERIES
A - Moorgate 1904-22? (recoded D)
B - Drayton Park 1904-53 (recoded NC and operated by 1939 cabin)
C - Finsbury Park 1904-39 (then operated by NC cabin of 1939)
D - Moorgate 1922?-37 (recoded ND)

NORTHERN LINE EXTENSIONS
NA - NB Unused
NC - Drayton Park 1953-76 Finsbury Pk Relay Room 1939-64
ND - Moorgate 1937-76
NE - NG Unused
NH - Park Junction 1939-84
NH - Highgate Depot Panel (E Finchley) 1989-
NJ - NM Unused
NN - Highgate (Archway) 1939-61 IMR 1961-
NP - East Finchley 1939-61 IMR 1961-
NQ - Finchley Central 1940-69 IMR 1969- (Mill Hill East SB starter from 1941)
NR - Unused
NS - Woodside Park GF 1940-65
NT - Totteridge GF 1940-
NU - High Barnet 1940-71 IMR 1971-
NV - Mill Hill East GF 1943-64 (was NQ 1941-43)

PICCADILLY LINE ORIGINAL SERIES
A - Hyde Park Corner 1906-31 (recoded B)
B - Covent Garden 1906-31 (recoded C)
B - Hyde Park Corner 1931-79 (replaced by Down St IMR PB)
C - Covent Garden 1931-79 (crossover removed)
D - Holborn/Aldwych 1906-80 (replaced by IMR PD)
E - York Road 1906-64 (crossover removed)
F - Finsbury Park 1906-65? (replaced by IMR VK)
G - Wood Green 1932-80 (replaced by IMR PG)
H - Unused
J - Arnos Grove 1932-82 (replaced by IMR PJ)
K - Oakwood 1933-82 (replaced by IMR PK)
L - Kings Cross (Loop 1927 and Crossover 1956) 1927-58 IMR 1958-
M - Cockfosters 1933-82 (replaced by IMR PM)

PICCADILLY LINE CURRENT
PB - Down Street IMR 1979-
PD - Holborn/Aldwych IMR 1980-
PG - Wood Green IMR 1980-
PJ - Arnos Grove IMR 1982-
PK - Oakwood IMR 1982-
PM - Cockfosters IMR 1982-

Other tube lines to follow...