Independent thesis Advanced level (professional degree), 20 credits / 30 HE credits
The trend in the transport sector is moving towards eco-friendly, fast and convenient transportation,
this results in higher demands on railway transports. To meet the demand and quality requirements,
the Swedish railway network will have to expand. The cheapest way is to expand little by little but
what impact do these small steps actually have on the capacity?
This thesis examines the interactions of different improvement for the capacity on a single-track
railway. Through simulations in the software tool RailSys this report studies what effect block signals,
extra meeting stations and rebuilding existing two track passing loops to three track loops have on
the capacity. Emphasis has been placed on how these three factors interact with each other. By a full
factorial experiment in two levels the factor interactions have been identified and quantified.
The factorial experiment with three factors proved to be problematic in RailSys due to the built in
problem to properly manage three track-stations on single-track lines. This is shown by higher delays
in the infrastructure scenarios with three-track stations than in those without. Because of this, the
infrastructure scenarios with three-track stations were removed from further analysis.
We now have a factorial experiment with two factors, block signals and extra meeting stations. The
reference interval shows that interactions between these two factors can’t be shown. However, the
experiment shows that more passing stations reduce average delays for both freight and passenger
trains. For block signals, it is only proved that passenger traffic takes advantage of them, this is
probably due in large part to the timetable.
2011. , 60 p.