Reliability of Stockholm Subway - Index of

The charts on figures 4.7 and 4.8 show that there is a common tendency at the chosen
station set. Number of commuters increases considerably after 6:00, reaches its peak
at 8:00 and declines rapidly until 9:00. Then it continues to slightly decrease until
10:00. reaching its lowest value during the daytime. After that downfall number of
passenger entering and leaving the terminals keeps on insignificantly growing until
14:00. At 14:00 the growth changes its character. The slopes get steeper. The graphs
reach their evening peaks around 17:00. After that the number of passengers
dramatically decreases until 19:00. Analyzing that variation of passenger flow at the
presented stations one can identify three periods during the daytime, which will be
interesting for reliability analysis: morning peak hour 6:30 – 9:00, midday off-peak
9:00 – 14:30, evening peak hour 14:30 – 19:00.
4.2.4 Signaling system
In spring 1999 the old signaling system of the Green Line was completely replaced
with the new one produced by Siemens. The new safety system is continuous with the
automatic train control (ATC) feature. Continuous means that the signal continually is
sent by the system through the rails wherever the train is.
The signal system was constructed with the following technical specification: the train
length is three stock cars of C20 around 140 meters, maximum speed is 70 km/h and
50 km/h at the platforms, maximum acceleration/deceleration is 1,1 m/s 2 , and
designed headway of 90 seconds between trains during ordinary transport service.
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