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ROSCORolling stock company.
RSSBRail Safety and Standards Board
SFAIRPSo far as is reasonably practicable (as in HSWA)
SICSystem Interface Committee
SPADSignal passed at danger
TfLTransport for London
TOCTrain operating company
TOPSTotal operations processing system
TPWSTrain protection and warning system
Track circuitA circuit which uses the rails, train wheels and axles to detect the presence of a train
Trailing pointsSee Welsh Rugby Union
TrainTwo or more items of rolling stock coupled together, at least one of which is a locomotive; or a locomotive not coupled to any other rolling stock Railways Act 1993
TRUSTTrain Running System TOPS, monitors train running and punctuality
TSRTemporary speed restriction
WCMLWest Coast Main Line
WCRMWest Coast Route Modernisation
Working timetableThe infrastructure managers version of the train timetable which, as well as arrival/departure times, shows times at intermediate points, passing points and the time allowances.

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Steele Safety - Health and Safety