Abridgment of shunting of track circuit in a polyphase system of continuous inductive train control

1928 ◽  
Vol 47 (7) ◽  
pp. 520-523
Author(s):  
C. F. Estwick
Keyword(s):  
Train Control ◽  
Track Circuit

Manage Successful Brownfield Applications

2018 ◽  
Author(s):  
Jian Sun ◽  
Kevin Blostic
Keyword(s):  
Mixed Mode ◽  
System Capacity ◽  
Signaling System ◽  
Maintenance Costs ◽  
Signaling Systems ◽  
Train Control ◽  
Operation And Maintenance ◽  
Track Circuit ◽  
Railroad Applications ◽  
New System

This paper provides a unique perspective on successful brownfield railroad applications. It presents realistic challenges and solutions when applying a turnkey solution with a replacement or an overlay system. Brownfield commissioning takes place when an existing infrastructure is to upgrade to a new system with a different technology than the incumbent one. As signaling systems are getting more and more complex, it is extremely important to maintain robustness in the system design as well as project execution, such as logistics, documentation, and issue reporting. Many transportation authorities are moving from their current train control signaling system to a new system to combat obsolescence issues, to gain better system capacity, and to lower operation and maintenance costs. This paper discusses brownfield commissioning in general, and also presents specific cases in migration from a track circuit interlocking system to a Communications Based Train Control (CBTC) system. These two systems have distinct characteristics that provide opportunities of coexistence, but also introduce difficulties in mixed-mode operations.

Risk Based Broken Rail Detection on Railways

2014 ◽  
Author(s):  
David F. Thurston
Keyword(s):  
Control Systems ◽  
Risk Mitigation ◽  
New Technology ◽  
General System ◽  
The United States ◽  
Practical Application ◽  
Train Control ◽  
Rail Systems ◽  
Track Circuits ◽  
Track Circuit

There has been a long debate among train control professionals related to broken rail detection; where it is required and how it is achieved. Despite this ongoing discussion, there has been little research in terms of the actual practical application of new technology or risk mitigation approaches since conventional track circuits have been applied to detect broken rails. This paper first looks at conventional broken rail detection as implemented with various track circuit types, then reviews the current research on alternate means of detection throughout the world. The paper will then quantify a risk based approach utilizing existing technologies to mitigate the broken rail requirements currently mandated for higher speed rail systems in the United States. Further, the implications for train control systems for both transit and the general system of railroads will be examined.

Modeling and Verification for Track Circuit Encoding in Train Control Center Based on UML and TA

2014 ◽  
Vol 9 (10) ◽  
Author(s):  
Lei Yuan ◽  
Lijuan Wang ◽  
Dewang Chen ◽  
Amie Albrecht
Keyword(s):  
Control Center ◽  
Train Control ◽  
Track Circuit ◽  
Train Control Center

Consequences of Failed Track Circuits on Conventional Signaling System in CBTC Projects

2013 ◽  
Author(s):  
Kenneth M. Diemunsch ◽  
Daniel J. Reitz
Keyword(s):  
Signaling System ◽  
Train Control ◽  
Backup System ◽  
Train Operation ◽  
Track Circuits ◽  
Track Circuit ◽  
Transit Agencies ◽  
The Relationship ◽  
Multiple Scenarios ◽  
Rapid Mass

In recent years, many rapid mass transit agencies have chosen Communication Based Train Control (CBTC) technology to refurbish their signaling system or to equip a new line. CBTC technology is a type of Automatic Train Control (ATC) that allows transit agencies to increase nominal throughput and to improve safety. The main functions of CBTC are described in [1.] and [2.]. This technology can operate without fixed wayside track detectors such as track circuits. However, track circuit equipment continues to be implemented on the tracks and in the equipment rooms. For authorities under the Federal Railroad Administration, current regulations require use of track circuit but the main functional reason is to have a backup system in case of CBTC failure. Most transit agencies decide to include track circuit occupied and vacant status into the CBTC system in order to enhance safety. How to enhance safety and keep train operation efficient during track circuit failure is a challenge for CBTC projects. This paper discusses the relationship between the CBTC and the conventional interlocking system when track circuit failure occurs. The analysis in this paper applies to both relay and solid state interlocking systems as both technologies have to deal with the same impact under this scenario. The method of detection of track circuit failure by the CBTC system and the possible restrictions on CBTC train operation are not presented. The paper focuses on the interface between the CBTC and the signaling system. It begins by introducing the different types of track circuit failures and their consequences on conventional signaling system to address and compare multiple scenarios. Then, the paper discusses how the CBTC system can affect the conventional signaling system equipment, such as signals and train stops, once it has detected a track circuit failure. Transit agencies’ different possible approaches to manage track circuits failures within the context of an operating CBTC system are explained.

Autonomous Train Control and Track Circuit Inspection System

2013 ◽  
Author(s):  
Jeffrey K. Meunier ◽  
Amaury Rolin
Keyword(s):  
Frequency Control ◽  
Inspection System ◽  
Technical Approach ◽  
Passenger Cars ◽  
Inductively Coupled ◽  
Train Control ◽  
Control Signals ◽  
Broadband Signal ◽  
Curved Track ◽  
Track Circuit

The Washington D.C. Metro utilizes an Automatic Train Control (ATC) system designed in the mid 1970’s. This ATC system employs passive track bed markers and antennas inductively coupled to the track to send and receive audio frequency control signals over the rails. The ATC system is only installed in revenue passenger cars and has never been installed on any other vehicle. Recently, a new inspection vehicle was delivered that includes an inspection module that interfaces with this train control system to inspect the control and track occupancy signals. This paper will discuss the challenges of designing a track circuit inspection system and retrofitting a refurbished ATC system designed for a revenue vehicle to a custom self propelled inspection car to ensure uniform inductive coupling over curved track, maintaining dynamic clearance envelop of the inspection car and design of custom broadband signal antennas to prevent interference. Additionally this paper will discuss the technical approach for conducting the inspection and results achieved during testing.

Intelligent Antennas for Mitigating GNSS Jamming & Spoofing Hazards on the ERTMS Train Control

2019 ◽  
Author(s):  
Cosimo Stallo ◽  
Pietro Salvatori ◽  
Andrea Coluccia ◽  
Massimo Capozzi ◽  
Giovanni Gamba ◽  
...  
Keyword(s):  
Train Control
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