Abstract
This paper develops a passenger-based technique to calculate the overall system dependability (or, equivalently, system availability) of a rail rapid transit system, and demonstrates the technique by means of a numerical example, based on an actual transit system. The technique uses as dependability the proportion of passengers who complete their trip with no delay greater than a given tolerance limit, and takes into account dwell and blockage delays, operating policies in response to an incident, and passenger flow rates. The resulting technique is intended to tie together the various concepts of reliability, maintainability, failure modes and effects, etc., into a single measure of system performance.
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