Latent Energy Savings Due To The Innovative Use
Of Advisory Speeds To Avoid Occupation Conflicts
Author(s)
F. Mehta, C. Rößiger & M. Montigel
Abstract
Track occupation conflicts are frequent in standard railway operations today.
Train drivers, who are not aware of such conflicts in advance, are forced to stop,
which results in additional delays, timetable instability, and a waste of energy.
This could be avoided if they were informed about the conflict and had a chance
to adapt their driving behaviour accordingly. The innovative computer-based
train control system \“Automatic Functions Lötschberg” (AF), developed by
systransis Ltd, tries to reduce these negative effects by sending advisory speeds
to the drivers of conflict affected trains in the Lötschberg base tunnel.
This article presents the results of a study done using real operational data
from the Lötschberg base tunnel to estimate the energy savings due to the AF
sending advisory speeds. These results are then extrapolated to estimate the
latent energy savings that could be achieved if a system like the AF were in
operation over the entire Swiss railway network.
Keywords: advanced train control, energy savings, advisory speeds.
1 Introduction
With a length of 34.6 km under the Swiss Alps, the Lötschberg base tunnel is
currently the longest land tunnel in the world. The computer-based train control
system \“Automatic Functions Lötschberg” (AF), developed by systransis Ltd. as
a subcontractor of Thales Ltd, has been monitoring and controlling the train
traffic through the Lötschberg base tunnel since its opening in December 2007.
The topology of the tunnel introduces special challenges in its operation. The
northernmost two thirds of the tunnel is a single-track section, which feeds into a
two-track section in the south via the high-speed point \“W60”. Figure 1
illustrates this topology. Solving track occupation conflicts between trains is
especially important since the single-track section needs to be used optimally.
Keywords
advanced train control, energy savings, advisory speeds
Related Book
Other papers in this volume
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