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

[motormanmet]

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...

[motormanmet]

Addition:

PICCADILLY LINE
Y - Piccadilly Circus Station starting signals both roads 1915?-27

These were controlled by Piccadilly Circus Bakerloo line cabin (B) in order to hold the last Picc trains at night for interchange. From 1927-34, these were controlled by Covent Garden cabin.

BZ - Piccadilly Circus Station starting signals 1934-39

Control was transferred back to Piccadilly Circus Bakerloo.

BPZ - Piccadilly Circus Station starting signals 1939-80

Control was transferred to the new cabin at Piccadilly Circus (BP) and the existing (at the time original 1906 sliding spectacle) starting signals in the tunnel mouths were recoded 'BPZ'.

Unsure as to why i didn't include these...

Also a point of interest - the 3 Yerkes tube lines (Bak/Pic/Hamp) never originally used 'C' in their series of cabin codes, presumably to leave a spare letter for the future to slot in any changes and make recoding existing cabins easier. Note this with the Piccadilly Line (Hyde Pk/Covent Garden) and Northern (Kennnington/Ch X). In both these cases, it was due to 'A' codes being abolished in the 1930s when 'S'-auto signals were gradually being re-prefixed 'A', meaning 'A' and 'B'-coded cabins would have to step-up a letter, hence the first use of 'C'. On the Bakerloo, the new Paddington crossover of 1913 used the logically spare code 'C', with 'B' going from the 1915-closed Marylebone cabin to the new replacement Piccadilly Circus crossover of 1915. It would have been more logical to have Paddington as 'B' and Picc Cir as 'C' though to keep line order but Paddington came first and used the only spare code.