|2016 - April - Burns - Movement Authorities - A Systems Framework|
Peter Burns MBA, BAppSci (Elect), MIRSE, CPEng, MIEAust
Movement Authorities are shown to be found in all safeworking systems and having characteristics which are common to all of them. The process for issuing a Movement Authority may be characterised as the formation of a contract between the train and the interlocking.
Looking at fixed signal systems, the signal is found to fill three distinct functions, one of which is the communicating of movement authorities.
Turning to ERTMS and CBTC systems, it is shown that their central functionality is of a nature that does not require treatment as a movement authority. Benefits can be obtained by recognising the different natures of the three distinct