University of Birmingham and Network Rail List of Acronyms and Abbreviations for Railways (LAAR) Mark 24, February 2011 This list was originally produced by the Railway Systems Group at the University of Sheffield, in cooperation with staff from Railtrack, Network Rail, Bechtel and HMRI. It was expanded with the support of many other railwy industry organisations and individuals. Members of staff at the University of Birmingham and the team of The Railway Consultancy update the Rail Lexicon on a regular basis. Obsolete terminology is shown in grey, where the status is known. Comments are welcomed by:
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[email protected] . In general, the UK term “railway” is used rather than the US term “railroad”. 3G – 3rd Generation Mobile Phone ATR – (1) Automatic Train Reporting 4GL – Fourth Generation Language ATR – (2) Automatic Train Regulation ATS – (1) Automatic Train Stop A– A – ATS – (2) Automatic Train Supervision ATS – (3) Applicable Timetable Service AAR – Association of American Railroads ATSS – Automatic Train Supervision System AB – Absolute Block (system of working) ATT – Active Tilting Train ABCL – Automatic Barrier Crossing Locally ATTA – Automatic Track Top and Alignment monitored ATWS – Automatic Track Warning System ABCR – Automatic Barrier Crossing Remotely monitored AVACS – Aire VAlley Control System ADIF – Spanish Infrastructure Manager AVB – Automatic Vacuum Brake AHB – Automatic half barrier crossing AVI – Automatic Vehicle Identification AHQ – (British Transport Police) Area Headquarters AWB – Advance