Structure numbers: the London Underground system

This listing gives the London Underground's equivalent to the ELR system, and is believed current to the mid-1980s. A cursory glance suggests that the codes only apply to structures in non-tunnel sections. Any missing data would be welcome.

BC	Borough Council	Central	White City depot to White City
BT	Bakerloo Tube	Bakerloo	Queens Park to Stonebridge Park
C	Circle	Circle	Aldgate to Paddington to High Street Kensington
CMR	Chesham Railway	Metropolitan	Chalfont & Latimer to Chesham
D	District	District	Ealing Broadway to Upminster; Acton Town to Heathrow; South Harrow to North Ealing
E	Edgware line	Northern	Finchley Central to Mill Hill East
EL	East London line	East London	East London Line
ES	Ealing & Shepherd's Bush line	Central	White City to Ealing Broadway
HB	High Barnet line	Northern	Park Junction to High Barnet
HC	Hammersmith & City line	Hammersmith & City	Paddington to Hammersmith
JE	Jubilee line Extention	Jubilee	Canning Town to Stratford
MLNE	Metropolitan and London & North Eastern Railway joint line	Metropolitan	Moor Park to Watford
MR	Metropolitan Railway	Metropolitan	Baker Street to Amersham
N	Newbury Park line	Central	Newbury Park to Woodford
NT	Northern Tube	Northern	South Wimbledon to Morden depot; Golders Green to Edgware
O	Ongar line	Central	Leyton to Ongar
P	Piccadilly line	Piccadilly	South Harrow to Rayners Lane
PT	Piccadilly Tube	Piccadilly	Bounds Green to Cockfosters
R	Ruislip line	Central	North Acton to West Ruislip
S	Stanmore line	Jubilee	Wembley Park to Stanmore
T	Tube line	?	?
U	Uxbridge line	Metropolitan	Harrow-on-the-Hill to Uxbridge
VT	Victoria Tube	Victoria	Northumberland Park depot branch