The following paper provides a simplified measure of the service availability of an APM system, which produces the same results as the more complex measure presently being used by the industry. Service availability can be simply, directly and accurately measured according to only the two parts of the APM system that passengers encounter for service - the trains and the stations. Indirectly, the simplified measure takes into account the reliability of the APM subsystems and components - i.e, trains, train control, traction power, auxiliary power, station equipment, guideways and guideway equipment, etc. Only two types of events are necessary to be counted - downtime of the cars of a train and downtime of station platform doors (or the platforms where there are no platform doors). While the methodology that follows was developed for APM systems it is applicable to all modes of public transport.
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