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 (e.g. the Jubilee line extension) 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