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Sub-threshold delays and GB timetable quality

Sub-threshold delays and GB timetable quality
Sub-threshold delays and GB timetable quality
Performance on railways in Great Britain (GB) has improved with the reduction in traffic levels due to Covid-19. However, if and when traffic levels return to (and potentially exceed) pre-Covid levels, performance is likely to decline again, and a better understanding of the relationships between timetable characteristics and performance will be needed. It is proposed that some recurring sub-threshold delays are related to timetable quality issues, particularly in relation to the allocation of dwell and running time allowances (or supplements) in the timetable planning rules. High-level analysis of performance data supports this hypothesis, showing consistent levels of sub-threshold delay at busy locations on the network, with some running time delay recovery at major stations with extended scheduled dwell times. Detailed analysis of timetable planning rules and historic timetable and sub-threshold delay data indicates some clear relationships between the dwell and running time allowances provided and resulting performance. However, these relationships can be complicated and obscured by the presence of multiple sources of secondary delays on busier sections of the network. The initial application of location-specific relationships to predict cumulative performance over longer route sections is demonstrated.
Armstrong, John
5fafa91e-39c1-4d1d-a331-564558aaa638
Preston, Jonathan
ef81c42e-c896-4768-92d1-052662037f0b
Zieger, Stephan
3645438d-1a04-4c12-ad67-e18c770473ee
Niessen, N.
5792c5b3-f7d1-477a-8e4a-a9fd5774c99f
Armstrong, John
5fafa91e-39c1-4d1d-a331-564558aaa638
Preston, Jonathan
ef81c42e-c896-4768-92d1-052662037f0b
Zieger, Stephan
3645438d-1a04-4c12-ad67-e18c770473ee
Niessen, N.
5792c5b3-f7d1-477a-8e4a-a9fd5774c99f

Armstrong, John, Preston, Jonathan, Zieger, Stephan and Niessen, N. (2021) Sub-threshold delays and GB timetable quality. RailBeijing 2021, On-Line, Beijing, China. 03 - 06 Nov 2021. 20 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Performance on railways in Great Britain (GB) has improved with the reduction in traffic levels due to Covid-19. However, if and when traffic levels return to (and potentially exceed) pre-Covid levels, performance is likely to decline again, and a better understanding of the relationships between timetable characteristics and performance will be needed. It is proposed that some recurring sub-threshold delays are related to timetable quality issues, particularly in relation to the allocation of dwell and running time allowances (or supplements) in the timetable planning rules. High-level analysis of performance data supports this hypothesis, showing consistent levels of sub-threshold delay at busy locations on the network, with some running time delay recovery at major stations with extended scheduled dwell times. Detailed analysis of timetable planning rules and historic timetable and sub-threshold delay data indicates some clear relationships between the dwell and running time allowances provided and resulting performance. However, these relationships can be complicated and obscured by the presence of multiple sources of secondary delays on busier sections of the network. The initial application of location-specific relationships to predict cumulative performance over longer route sections is demonstrated.

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Sub-Threshold Delays and GB Timetable Quality - Revised - Accepted Manuscript
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More information

Published date: 3 November 2021
Venue - Dates: RailBeijing 2021, On-Line, Beijing, China, 2021-11-03 - 2021-11-06

Identifiers

Local EPrints ID: 454703
URI: http://eprints.soton.ac.uk/id/eprint/454703
PURE UUID: cab431fd-74e6-496f-b846-671e362f2542
ORCID for John Armstrong: ORCID iD orcid.org/0000-0002-2648-6307
ORCID for Jonathan Preston: ORCID iD orcid.org/0000-0002-6866-049X

Catalogue record

Date deposited: 21 Feb 2022 17:43
Last modified: 17 Mar 2024 03:04

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Contributors

Author: John Armstrong ORCID iD
Author: Stephan Zieger
Author: N. Niessen

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