From Single To Double Track:
Effects Of Alternative Extension Measures
Author(s)
O. Lindfeldt
Abstract
Extension of single-track lines into double-track will be an important part of
future rail investments in Sweden. Most Swedish railway lines are single-track
and the steady growth in demand for passenger and freight transportation calls
for more capacity, which in turn imposes a need for more double-track sections.
This paper points out three minor measures that can be taken on single-track
lines before they are completely extended into double-tracks: additional crossing
loops, extended crossing loops to enable parallel entrance, and partial doubletracks.
A generic model for timetable analysis, TVEM (Timetable Variant
Evaluation Model), is applied to evaluate the effect of the three measures
through generation of 20,000–50,000 alternative timetables.
The evaluation shows that none of the measures significantly affect the
maximum capacity, i.e. the number of trains in the best timetable alternative.
This indicates that the longest inter-loop distance, has to be substantially
shortened through either an additional crossing loop or a partial double-track. A
parallel entrance facility on a crossing loop does not affect the time distance
between adjacent loops so much that it can be considered to increase maximum
capacity.
However, all three measures result in higher timetable flexibility, i.e. number
of timetable variants for a given number of trains (capacity level). Partial doubletracks
give much more timetable flexibility than additional crossing loops and
parallel entrance facilities on crossing loops.
It is reasonable that higher timetable flexibility imposes a higher practical,
realizable capacity, since a line section that can be scheduled flexibly is less
likely to constrain the overall capacity on the entire line.
Keywords: single-track, double-track, crossing loop, scheduling, railway
capacity.
Keywords
single-track, double-track, crossing loop, scheduling, railwaycapacity
Related Book
Other papers in this volume
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