Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
To hear of train disruptions on the news has been more a rule than an exception in recent years,
whether it is signal failure or torn down contact lines, all these disturbances have caused enormous
problems both for passengers and goods. A big reason that disruptions have such a big impact on the
railway system is that there are very limited opportunities to divert trains. However, this may change
with the future high-speed network in Sweden, where the first stage is the Eastern Link, a new
double track railway between Järna - Linköping for speeds up to 320 km / h. Thus, there will be two
double-track railways on the route and moreover the single-tracked Nyköping line, which will open
up entirely new opportunities to reroute high-speed trains from the Eastern Link when future failures
The purpose of this work is to see what effects the rerouting of high-speed train has on other trains
as well as on the rerouted trains. To see these effects a case study is being carried out on the Eastern
Link with an unplanned shutdown between Norrköping - Nyköping, where high-speed trains will be
diverted in four different scenarios. The goal of the study is to find the best alternative route for the
Eastern Link trains in terms of travel time, impact on the other traffic and the number of stations
served. Finally, a general model is developed to estimate the total diversion time for high-speed
As the Eastern Link is scheduled to be completed in 15 years, other countries like Italy and France
that already had a large high-speed network are looked into on the rerouting possibilities they have.
A common thing for both countries is that they have built many connection points between the
ordinary and high-speed network which provides great opportunities for the rerouting of high-speed
The case study is being done with the simulation software RailSys where the four study options and
the comparing alternative are simulated. The simulation takes place in the area of Södertälje -
Hallsberg - Linköping - Nyköping. In order to get a realistic picture of how the traffic can come to look
at the opening of The Eastern Link, year 2030, both forecasts and current timetables (T15) are used.
The use of T15 is being motivated that no travel time reductions will be made on the relevant
courses and that the Western and Southern main line are already heavily loaded.
The result indicates that the diversion of high-speed rail has a very marginal impact on other traffic,
this is explained by the fact they can keep the track speed limit. In an unplanned shutdown between
Norrköping-Nyköping study option 3 (UA3) is recommended, this option uses both the Southern
Main Line and the Nyköping line. The developed model shows that there is potential to calculate the
total diversion time and thus better able to predict arrival times for the rerouted trains.