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Union Switch & Signal serves all of the Class I freight railroads, passenger railroads, and numerous regional and short line railroads in the United States, Canada, and Mexico. US&S serves rail-based transit operators in North America and around the world. US&S also serves mass transit operators in Korea and Taiwan and railroads and mass transit operators in China.
Case Studies
Shanghai Line 2
The project covers the control of a 19.5-km double-track, heavy rail transit line that runs in an east-west direction though Shanghai. It crosses Line 1 at People's Square and then continues through the political, cultural, and commercial center of Shanghai. It proceeds across the Huang-Pu River to the Pu-Dong area, which is the newly developed economic zone of Shanghai.
The system uses the AF-900TM series profile-based ATC system technology, which has been in service on the Los Angeles Metro Green Line since 1995 and has been deployed in Copenhagen. The AF-900 series digital frequency shift keyed (FSK) track circuit detects train presence and is capable of transmitting 76 bits of data to a train's on-board control system.
This large data transmission capacity enables the information corresponding to the functions required for driver-less operation to be transmitted to and processed by the Microcab® 900 on-board train control system, which is responsible for governing and executing vehicle functions such as brake assurance, propulsion control, overspeed detection, and door control.
The Shanghai Line 2 ATC system is comprised of three subsystems: automatic train protection (ATP), automatic train operation (ATO), and automatic train supervision (ATS).
A central control facility is also part of the Shanghai Line 2 ATS subsystem. Its primary function is to monitor ATC operation and to automatically route trains to the applicable wayside locations to maintain time and table schedules.
Key Points
- Double track mainline heavy rail
- Fully automatic, driver-less profile-based operation
- Digital FSK track circuits
- 24 trains/day
- Full ATC operation (ATP, ATO, ATS)
Line Characteristics
- Line length: 17km
- Stations: 12 (underground)
- Operation headway: 2 minutes
- Station dwell time: 25 - 35 seconds
- Average train speed: 35 km/hour
- Train length: 6 - 8 cars
Copenhagen Metro
The Copenhagen Metro is the first driverless transit system, built to the stringent CENELEC standards for safety and reliability. It is a shining example of Union Switch & Signal's Automatic Train Control technology, utilizing the latest microprocessor-based interlockings, digital track circuits and cab signaling systems.
The first of three phases went into revenue service in October 2002. The system features the AF-902TM digital frequency shift keyed (FSK) track circuit, the Microcab® on-board cab signalling/vehicle control system, and the US&S Microlok® II wayside control system.
The AF-902 track circuit transmits the speed and braking commands to a Microcab® cab signalling/on-board vehicle control system, which is responsible for governing and executing vehicle functions such as brake assurance, propulsion control, overspeed detection, and door control.
The Microlok® II wayside control system delivers the vital digital vehicle commands to the AF-902TM track circuit through a serial link and executes vital wayside logic required for mainline and depot interlocking control.
The Copenhagen ATC system is comprised of three subsystems: automatic train protection (ATP), automatic train operation (ATO), and automatic train supervision (ATS). The ATP system is responsible for vital, safety-critical wayside functions such as train detection, train separation and interlocking control, and vital vehicle control functions such as vital braking, propulsion control and speed limit enforcement. The components that comprise the ATP subsystem (AF-902 track circuits, Microlok II wayside control system, and Microcab on-board vehicle control system) are CENELEC-certified.
A central control system is part of the ATS subsystem. The central control system automatically manages train schedules and automatically recovers from timetable deviations. The central control system also assists the ATC supervisor in dealing with unusual situations and initiates back-up operation if a major technical failure occurs.
Key Points
- Double track mainline heavy rail
- Fully automatic, driver-less, profile-based operation
- Digital FSK track circuits
- Microprocessor interlocking control
- Microprocessor on-board vehicle control
- 24/7 operation
- Full ATC capabilities including ATP, ATO, ATS
- CENELEC-certified
Line Characteristics
- Line length: 13.9km
- Stations: 14
- Operation headway: 1-5 minutes (15 minutes off-peak at night)
- Train length: 3 articulated cars (each 39 meters long)
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