Information Logistics for Maintenance of Railway Signalling Systems: A Case Study

2013 ◽  
Vol 2 (2) ◽  
pp. 97-112
Author(s):  
A. Morant ◽  
R. Karim ◽  
P.-O. Larsson-Kråik
Keyword(s):  
Information Logistics ◽  
Railway Signalling ◽  
Signalling Systems

scholarly journals Reliability and Inspection Modelling of Railway Signalling Systems

Modelling ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 344-354
Author(s):  
Nikesh Kumar ◽  
Kong Fah Tee
Keyword(s):  
High Reliability ◽  
Signalling System ◽  
System A ◽  
Long Run ◽  
Modelling Techniques ◽  
Inspection And Maintenance ◽  
Railway Signalling ◽  
Railway Operation ◽  
Signalling Systems

The railway is one of the most prominent models of transportation across the globe and it carries a large number of people, thus requiring high reliability, maintainability and safety. The reliability of railways mostly depends on an effective signalling system, making it one of the critical parts of railway operation. A signalling system is part of a large array of systems with interconnected components and subcomponents. Therefore, there is a need to make the signalling system more reliable and optimised with enhanced fault detection. Proper inspection and maintenance are required to make the signalling system reliable and safe. In this study, different inspection modelling techniques are applied to find the reliability of the signalling system. The signalling system has been divided into subsystems (signal unit, track unit, point-and-point machine) considering their importance and their effects on the failure rate of the entire signalling system. Inspection modelling of each subsystem has been conducted to provide the basis for the entire signalling system. A case study has been investigated to validate the model developed in one of the busiest tracks in eastern India. The obtained data thus are used to analyse the inspection pattern of signalling subsystems. Special attention to maintenance for inspection activities and logistics support has been taken into consideration, which is required to improve the reliability and maintainability of signalling subsystems and systems to make the railway signalling system sustainable in the long run.

scholarly journals Safety and availability evaluation of railway operation based on the state of signalling systems

2016 ◽  
Vol 231 (2) ◽  
pp. 226-238 ◽  
Author(s):  
Amparo Morant ◽  
Anna Gustafson ◽  
Peter Söderholm ◽  
Per-Olof Larsson-Kråik ◽  
Uday Kumar
Keyword(s):  
Markov Model ◽  
Risk Mitigation ◽  
Mitigation Measures ◽  
Safe Operation ◽  
Repair Rate ◽  
Railway Traffic ◽  
Railway Signalling ◽  
Railway Operation ◽  
Signalling Systems

A framework is presented to evaluate the safety and availability of the railway operation, and quantifying the probability of the signalling system not to supervise the railway traffic. Since a failure of the signalling systems still allows operation of the railway, it is not sufficient to study their effect on the railway operation by considering only the failures and delays. The safety and availability are evaluated, handling both repairs and replacements by using a Markov model. The model is verified with a case study of Swedish railway signalling systems with different scenarios. The results show that the probability of being in a state where operation is possible in a degraded mode is greater than the probability of not being operative at all, which reduces delays but requires other risk mitigation measures to ensure safe operation. The effects that different improvements can have on the safety and availability of the railway operation are simulated. The results show that combining maintenance improvements to reduce the failure rate and increase the repair rate is more efficient at increasing the probability of being in an operative state and reducing the probability of operating in a degraded state.

scholarly journals A refinement-based development of a distributed signalling system

2021 ◽  
Author(s):  
Paulius Stankaitis ◽  
Alexei Iliasov ◽  
Tsutomu Kobayashi ◽  
Yamine Aït-Ameur ◽  
Fuyuki Ishikawa ◽  
...  
Keyword(s):  
Model Verification ◽  
Modelling Language ◽  
Distributed Protocol ◽  
Rigorous Approach ◽  
Railway Systems ◽  
Main Challenge ◽  
Stepwise Development ◽  
Railway Signalling ◽  
High Level ◽  
Signalling Systems

AbstractThe decentralised railway signalling systems have a potential to increase capacity, availability and reduce maintenance costs of railway networks. However, given the safety-critical nature of railway signalling and the complexity of novel distributed signalling solutions, their safety should be guaranteed by using thorough system validation methods. To achieve such a high-level of safety assurance of these complex signalling systems, scenario-based testing methods are far from being sufficient despite that they are still widely used in the industry. Formal verification is an alternative approach which provides a rigorous approach to verifying complex systems and has been successfully used in the railway domain. Despite the successes, little work has been done in applying formal methods for distributed railway systems. In our research we are working towards a multifaceted formal development methodology of complex railway signalling systems. The methodology is based on the Event-B modelling language which provides an expressive modelling language, a stepwise development and a proof-based model verification. In this paper, we present the application of the methodology for the development and verification of a distributed protocol for reservation of railway sections. The main challenge of this work is developing a distributed protocol which ensures safety and liveness of the distributed railway system when message delays are allowed in the model.

IT-Security in Railway Signalling Systems

2014 ◽  
pp. 56-64
Author(s):  
Christian Schlehuber ◽  
Erik Tews ◽  
Stefan Katzenbeisser
Keyword(s):  
It Security ◽  
Railway Signalling ◽  
Signalling Systems

MEASUREMENTS AND ANALYSIS OF ELECTROMAGNETIC INTERFERENCE IN A RAILWAY SIGNAL BOX — A CASE STUDY

2011 ◽  
Vol 18 (03) ◽  
pp. 285-303 ◽  
Author(s):  
STEFAN NISKA ◽  
HÅKAN SCHUNNESSON ◽  
UDAY KUMAR
Keyword(s):  
Electromagnetic Interference ◽  
Real System ◽  
Railway Systems ◽  
New Information ◽  
Railway Infrastructure ◽  
Railway Signal ◽  
Railway Signalling ◽  
And Control

In general railway infrastructure operates in a complex and non homogeneous environment where low power electronics has to function in the similar environment as large voltages and currents from the trains. The environment close to the railway tracks is heavily polluted by electromagnetic (EM) noise from the railway systems itself. The reliability of the railway signalling-, communication-, and control system depends on the degree of isolation from EM noise. It is important to observe the real system and its characteristics in real situation. The complexity of the infrastructure is not easy to simulate or calculate, and therefore measurements were performed on real system in operation. A large number of measurements were made on site at signalling systems and installations of Banverket (the Swedish Rail Administration). By studying and analyzing these measurements, the extent of EMI (Electromagnetic interferences) -related faults can be estimated. In situ measurements must be performed on systems that have obvious problems show increasingly fast and high transients in a DC signalling subsystem. The statistics also show an increased activity of transients during a period before a certain circuit in this system gets out of order. The presented results clearly show how the electromagnets interference effects he signalling system in a signalling box. The measurements in this case study have provided new information on a railway subsystem and have revealed frequencies that are difficult to explain at this moment.

scholarly journals AGUSTIN DE BETANCOURT AS CREATOR OF OPTICAL TELEGRAPH MACHINE USED ON THE FIRST EUROPEAN RAILWAY LINES AND PRECURSOR OF RAILWAY SIGNALLING SYSTEMS

2021 ◽  
Vol 7 (4) ◽  
pp. 631-644
Author(s):  
S. V. Vlasenko ◽  
◽  
S. A. Sushkov ◽  
S. V. Grishechko ◽  
◽  
...  
Keyword(s):  
Data Transmission ◽  
Human Vision ◽  
Railway Transport ◽  
Transmission Systems ◽  
Signaling Systems ◽  
Mechanical Signals ◽  
Mechanical Signal ◽  
Railway Signalling ◽  
Mechanical Devices ◽  
Signalling Systems

The origin of signalling principles, their purpose and development since the 4th century BC are described. Claude Chappe' s research on the peculiarities of human vision and the rationale for the choice of colors for the optical telegraph are presented. These principles are used in modern rail and road signaling systems with slight modifi cations to refl ect the development of technology. The transmission apparatus and the Claude Chappe alphabet are presented, documentary examples of its use in France are proposed, and the main disadvantages of this principle of data transmission are indicated. Further in the article, an alternative principle of data transmission using a single semaphore wing in an optical telegraph is presented. It was developed and introduced in 1798 between Madrid and Cadiz (Spain) by Agustin de Betancourt. The article shows the diagrams of the optical telegraph apparatus of Agustin de Betancourt, and also gives its comparison with fi rst mechanical signals used in railway transport. With references to historical documents and evidence, the evolution of the optical telegraph by Agustin de Betancourt from data transmission systems between cities to systems for the exchange of information between neighboring railway posts and stations on the fi rst railway lines is presented. The evolution of the telegraph from mechanical devices announcing the train approach to the railway post to the signals for train drivers thanks to the change of wing position is shown. As a transitional stage from mechanical to electrical signals in railway transport, the principle of operation of semaphores with kerosene lamps lit at night with light fi lters mechanically connected to the position of the wing is explained. Based on development of mechanical signals, the historical reasons for signal aspect with two lamps in diff erent modern signalling systems are presented. The article opens a new, previously little-known page of the activities by Agustin de Betancourt, who was not only the fi rst rector of the fi rst transport high school in Russia but also one of developers of data transmission systems used optical telegraph. His inventions such as mechanical signal with one wing are using in improved form in railway signalling systems up today.

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