Reliability of Stockholm Subway - Index of

3.4 Assumptions and limitations
The main limitation of the analysis is that the database RUST will not be 100%
accurate. Due to problems of different nature such as train misbehaving, disorder of
central system and etc., there is always a possibility that data is missing or inaccurate.
This factor limits wide data application, for example, it cannot be a basis for the
bonus payments according to the commercial agreements between SL and operators.
However available collected data is enough to evaluate subway performance for the
company‟s internal needs in order to reveal problematic track sections. The thesis
assumes that the data in RUST database is reliable, accurate and reflects the real
service.
The performance of the subway constantly changes throughout the time. The thesis
analyzes subway performance in March, 2010 during the most interesting and most
problematic daytime period: from 6:30 till 19:00, which includes morning and
evening peak hours as well as midday off-peak. All the results in the thesis indicate
the performance of the subway basing on this chosen time period.
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