BET British Electric Traction
BREL British Rail Engineering Ltd
EMB Electro-Mechanical Brake Co Ltd, West Bromwich
ERTCW Electric Railway & Tramway Carriage Works
DLR Docklands Light Railway
LCC London County Council
LPTB London Passenger Transport Board
LRTA Light Rapid Transit Association
LRTL Light Railway Transport League
LTE London Transport Executive
LUT London United Tramways
M&G Mountain and Gibson
MET Metropolitan Electric Tramways
PAYE Pay as you enter
TLRS Tramway & Light Railway Society
UCC Union Construction Co, Feltham
UDC Urban District Council
UEC United Electric Car Co, Preston