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Extending capacity utilisation measures from railway network links to nodes

Extending capacity utilisation measures from railway network links to nodes
Extending capacity utilisation measures from railway network links to nodes

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.

Capacity, Capacity utilisation, Junctions, Nodes, Railway, Stations
1743-3509
287-298
Armstrong, J.
5fafa91e-39c1-4d1d-a331-564558aaa638
Preston, J.
ef81c42e-c896-4768-92d1-052662037f0b
Armstrong, J.
5fafa91e-39c1-4d1d-a331-564558aaa638
Preston, J.
ef81c42e-c896-4768-92d1-052662037f0b

Armstrong, J. and Preston, J. (2012) Extending capacity utilisation measures from railway network links to nodes. WIT Transactions on Built Environment, 127, 287-298. (doi:10.2495/CR120241).

Record type: Article

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.

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More information

Published date: 2012
Keywords: Capacity, Capacity utilisation, Junctions, Nodes, Railway, Stations

Identifiers

Local EPrints ID: 419841
URI: https://eprints.soton.ac.uk/id/eprint/419841
ISSN: 1743-3509
PURE UUID: 2366ca8b-91f0-4518-9f19-6639dadd1453
ORCID for J. Preston: ORCID iD orcid.org/0000-0002-6866-049X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 14 Mar 2019 01:42

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