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Impact of signalling system on capacity – Comparing legacy ATC, ETCS Level 2 and ETCS Hybrid Level 3 systems
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Transport planning.ORCID iD: 0000-0003-4653-1424
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Transport planning. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0003-2023-0164
2022 (English)In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 23, article id 100322Article in journal, Editorial material (Refereed) Published
Abstract [en]

Most railways use fixed block technology, which could be replaced with moving block technology with associated high cost. It is therefore interesting to gradually upgrade the signalling system exploiting hybrid technologies. This paper aims to investigate the impact on capacity of various signalling systems (including fixed block technology and hybrid technology) using a microscopic simulation tool under scheduled (static) conditions without considering probability functions. To perform comparative analysis between European Train Control System (ETCS) Hybrid Level 3, ETCS Level 2, and the Swedish ATC2 legacy system, three signalling system scenarios are designed and capacity consumption is considered as a performance indicator. The study was performed on the central section of Stockholm’s commuter train network with peak hour conditions from the 2020 timetable. The results show that ETCS L2 delivers lower capacity consumption in total compared to the ATC2 legacy system. ETCS Hybrid Level 3 with existing trackside train detection and partially shortened block sections delivers lower capacity consumption compared to ETCS L2 and ATC2. The implementation of hybrid solutions such as ETCS Hybrid Level 3 in addition to allowing for gradual upgrading of signalling systems to the next generation (moving block system) can improve capacity of high-density commuter lines.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 23, article id 100322
Keywords [en]
ERTMS, ETCS, Moving block, Hybrid level 3, ATC2, Capacity consumption
National Category
Transport Systems and Logistics
Research subject
The KTH Railway Group - Tribology
Identifiers
URN: urn:nbn:se:kth:diva-305876DOI: 10.1016/j.jrtpm.2022.100322ISI: 000810006400001Scopus ID: 2-s2.0-85131439471OAI: oai:DiVA.org:kth-305876DiVA, id: diva2:1617825
Note

QC 20220627

Available from: 2021-12-07 Created: 2021-12-07 Last updated: 2023-03-07Bibliographically approved
In thesis
1. Challenges for ERTMS related to implementation, technology and railway capacity
Open this publication in new window or tab >>Challenges for ERTMS related to implementation, technology and railway capacity
2021 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The main purpose of European Rail Traffic Management System (ERTMS) is to remove crossborder barriers and create an interoperable railway network across European countries (Smithet al. 2012). Since its birth, ERTMS has faced several issues regarding interoperability andimplementation. In addition, one of the main questions for decision-makers and infrastructuremanagers regarding ERTMS is determining what level of operation is suitable to implementand deliver additional performance compared to legacy systems.This thesis aims to identify challenges for the ERTMS related to implementation, andinteroperability to achieve a mobile and intelligent railway transport system. A subsequentstudy on railway capacity is performed. It investigates the impact of ERTMS Hybrid Level 3(HL3) compared to the European Train Control System Level 2, (ETCS L2) and a Swedishlegacy system, ATC2. To achieve the goals of this study, two methodologies are used: 1)Literature review and 2) Simulation.The literature reviews were conducted in order to determine what the challenges ofimplementation of ERTMS are to resolve issues related to ERTMS subsystems (Global Systemfor Mobile Communication – Railway (GSM-R), and ETCS). ETCS needs to exploit hybridtechnologies for gradual deployment of next generation signalling systems. GSM-R must bereplaced with new technologies such as, long-term evolution (LTE) to support necessary datatransmission capacity for implementation of the next generation of signalling system.Furthermore, the literature review regarding achieving interoperable and intelligent railwaytransport shows that reducing wayside equipment have potential to provide a more costefficientrailway transport. To test and validate this finding, it is necessary to develop adaptedtools for railway and signalling systems. Providing flexible railway operation with backwardforwardinteroperability and hybrid solutions will make it possible to gradually upgrade currentsystems.As decision-makers look for additional performance in new signalling systems over legacyinstallations, the impact various signalling systems have on line capacity must be examined.To this end, a comparative analysis between legacy ATC, ETCS Level 2, and ETCS HybridLevel 3 using simulation tool was performed. The case study was performed on a highfrequency traffic commuter train line in Stockholm during peak hours. The results of study showHL3 delivers better performance compared to the legacy system and ETCS L2, and can deliveracceptable performance for a commuter train line with high density. Considering the casestudy, it can be concluded that HL3 delivers better performance on commuter train lines withhigh density.

Abstract [sv]

Huvudsyftet med European Rail Traffic Management System (ERTMS) är att avlägsnatekniska gränshinder och skapa ett driftskompatibelt järnvägsnät i europeiska länder (Smith etal. 2012). Sedan dess tillkomst har ERTMS utsatts för prövningar i flera frågor ominteroperabilitet och implementering. Dessutom är en av huvudfrågorna för beslutsfattare ochinfrastrukturförvaltare som hanterar ERTMS att bestämma vilken driftsnivå som är lämplig attimplementera och leverera ytterligare prestanda jämfört med äldre system.Denna avhandling syftar till att identifiera utmaningar för ERTMS relaterade till implementeringoch interoperabilitet för att uppnå ett mobilt och intelligent järnvägstransportsystem. I en studieundersöks effekterna på kapaciteten av ERTMS Hybrid Level 3 (HL3) jämfört med EuropeanTrain Control System Level 2, (ETCS L2) och ett svenskt äldre system, ATC2. För att uppnåmålen för denna studie används två metoder: 1) Litteraturgenomgång och 2) Simulering.Litteraturöversikterna genomfördes för att avgöra vilka utmaningar implementeringen avERTMS medför för att lösa problem relaterade till ERTMS delsystem (Global System for MobileCommunication - Railway (GSM-R) och ETCS). ETCS behöver utnyttja hybridteknik för gradvisanvändning av nästa generations signaleringssystem. GSM-R måste ersättas med ny teknik,såsom långtidsutveckling (LTE) för att stödja nödvändig dataöverföringskapacitet förimplementering av nästa generations signaleringssystem.Vidare visar litteraturöversikten om att uppnå interoperabla och intelligenta järnvägstransporteratt en minskning av utrustning i banan har potential att ge en mer kostnadseffektivajärnvägstransporter. För att testa och validera detta är det nödvändigt att utveckla anpassadeverktyg för signalsystem för järnväg. Att åstadkomma flexibel järnvägstrafik med bakåt-framåt-interoperabilitet och hybridlösningar kommer att göra det möjligt att gradvis uppgraderanuvarande system.Eftersom beslutsfattare letar efter ytterligare prestanda i nya signalsystem jämfört med äldresystem måste effekterna av olika signalsystem på linjekapaciteten undersökas. För dettaändamål utfördes en jämförande analys mellan äldre ATC, ETCS nivå 2 och ETCS hybridnivå3 med simuleringsverktyg. Fallstudien utfördes på en tättrafikerad pendeltågslinje i Stockholmunder högtrafikperiod. Resultaten av studien visar att HL3 ger bättre prestanda jämfört meddet äldre systemet och ETCS L2 och kan leverera acceptabla prestanda för en pendeltågslinjemed tät trafik. Med tanke på fallstudien kan man dra slutsatsen att HL3 ger bättre prestandapå pendeltågslinjer med tät trafik.

Place, publisher, year, edition, pages
Stockholm, Sweden 2021: KTH Royal Institute of Technology, 2021. p. 21
Series
TRITA-ABE-DLT ; 2144
National Category
Civil Engineering Transport Systems and Logistics
Research subject
Transport Science, Transport Systems
Identifiers
urn:nbn:se:kth:diva-305906 (URN)978-91-8040-032-9 (ISBN)
Presentation
2022-01-27, V318, Teknikringen 78, KTH Campus, Videolänk: https://kth-se.zoom.us/j/68075864233, Stockholm, 14:15 (English)
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Note

QC 20211213

Available from: 2021-12-13 Created: 2021-12-08 Last updated: 2022-06-25Bibliographically approved

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Ranjbar, VahidSipilä, Hans

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