CBTC based ATC for Shenyang Metro Line 1
Shenyang Metro Line 1
Project Overview
Union Switch & Signal Inc. (US&S®) has been awarded a contract to design and build a Communications Based Train Control (CBTC) system for the Shenyang Subway Line 1 and extension line. The CBTC system will provide the highest levels of operational performance, availability, efficiency, and safety.
The mainline length of Line 1 – Phase 1 and extension line of the Shenyang subway is 28.0 km, with 22 mainline stations, one depot, a test track, and an Operations Control Center (OCC). Line 1 will stretch from the westernmost Shisanhaojie Station to the easternmost Limingwenhuagong Station. Each of the 23 trains provided initially will have 6 cars.
The Ansaldo STS CBTC system is composed of the following major subsystems and equipment:
• Central Automatic Train Supervision (ATS) subsystem
• Wayside subsystem, which includes zone controllers, database storage unit, and MicroLok®
interlocking controllers
• Carborne controller
• Data Communications Subsystem (DCS)
The Ansaldo STS CBTC system will offer the latest technology, proven components, open interfaces, and the most robust hardware and software design and rigorous quality standards available today. When complete, the system will integrate the full complement of specified Automatic Train Protection (ATP), Automatic Train Operation (ATO), and Automatic Train Supervision (ATS) functions. The ATP functions provide fail-safe protection against collisions, excessive speed, and other hazardous conditions. ATO functions will fulfill basic train operation functions within the protection limits imposed by the ATP system. ATS functions will provide system status information, monitor system operations, and implement the automatic control for various functions of the system.
The key feature of the Ansaldo STS CBTC system is high system availability. The high availability of the system is a result of having traditional interlocking functions maintained on the wayside at each interlocking location using MicroLok II. The system will maintain safe train movements even if a zone controller fails. These safe train movements are enforced via the MicroLok interlocking controller and wayside LED home signals. In addition, if only the DCS fails, overspeed protection is enforced along with positive stops at all red aspect signals.
Key Design Features
• Five train operating modes: Ensures high availability of train movements
• Automatic driverless turn-back operation: Increases the efficiency of train movements
• Interlocking functions are wayside distributed: Permits the system to continue safely moving trains in the event a zone controller fails or communications between the zone controller and the train fail using the backup operating system
• DCS is dual path messaging with IP addressing: Permits each device (wireless and wired) to transmit and receive dual messages simultaneously, resulting in seamless data transfer during equipment failures
• Reliable system operation: Trains keep moving in the system if portions of the equipment fail
• Proven wayside, vehicle, and central office designs: Use of proven design techniques for high reliability and availability
• ATS architecture: Derived from years of experience being the industry-leader in computerized central offices
US&S puts safety first on all projects. A System Safety Program Plan (SSPP) was implemented from the planning stages of the CBTC system and will continue throughout the project’s life cycle. The SSPP describes all essential activities that are performed to show that the system meets or exceeds the specified qualitative and quantitative safety requirements.
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