Extending Capacity Utilisation Measures From
Railway Network Links To Nodes
Author(s)
J. Armstrong & J. Preston
Abstract
Railway capacity is increasingly scarce and valuable, but is also inherently
difficult to define and measure. To develop a full understanding of the capacity
situation in a railway network or any of its constituent nodes and links, measures
are needed of both (i) capacity provision, in terms of e.g. trains/passengers/TEU
per hour, and (ii) capacity utilisation or consumption, in terms of the percentage
of potential capacity that a given timetable utilises. This is because a given level
of capacity provision can be timetabled in different ways, with varying levels of
capacity utilisation, and, conversely, for a given level of capacity utilisation,
significantly different levels of capacity can be provided, depending upon the
train service pattern and mix. On busy networks, the typical objective is to
provide as much capacity as possible for a given level of capacity utilisation, or,
alternatively, to minimise the level of capacity utilisation for a given level of
capacity, thus maximising capacity while making efficient use of the network
and maintaining service reliability, which deteriorates as capacity utilisation
increases. Recognised Capacity Utilisation measures are available for network
links (e.g. the UIC 406 method, and the UK-specific CUI measure), but not for
the junctions and stations forming the nodes which typically constrain network
capacity. The benefits of extending the methodologies to nodes are widely
recognised, particularly in the context of ever-increasing capacity demands. This
paper describes the extension of existing capacity utilisation measures to enable
their application to both junction and station nodes, and the development of
algorithms and programs to enable their rapid calculation. Examples of simple
and complex nodes are presented, and needs for further work are identified.
Keywords: railway, capacity, capacity utilisation, nodes, junctions, stations.
Keywords
railway, capacity, capacity utilisation, nodes, junctions, stations
Related Book
Other papers in this volume
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