Page 88 - 捷運技術 第35期

80 Jeffrey S. Stover CITYFLO 650 System Overview

The CITYFLO 650 solution is a Communication-Based Train Control（CBTC） system that
does not require track circuits or an onboard operator, making it an ideal choice for new（green
field） installations. CITYFLO 650 can also be used as an overlay train control system to upgrade
existing fixed block（brown field）systems. It can be made to support mixed-mode operation and the
graceful upgrade and expansion of any metro as the wayside and vehicle equipment are
systematically upgraded through a retrofit program, eventually yielding improved transport capacity,
permitting higher speeds and greater regularity, reliability and utilization of the rolling stock assets.

1.1 CITYFLO 650 Design Features
CITYFLO 650 is a “state-of-the-art” system that uses the moving block technique to manage
the trains in a railway network - assuring the highest level of system performance, flexibility, safety,
reliability and availability. CITYFLO 650 uses service proven components, including up to date
CBTC products that have evolved from traditional ATC systems with a long service history in rail
transit. This evolution dates back to the 1970s with the fixed-block automatic train control
technology provided for San Francisco’s Bay Area Rapid Transit (BART).
The CITYFLO 650 ATC provides:

˙Inherent bi-directional operation
˙Continuous real-time data communication independent of track circuits

It fulfils the requirements of a communication-based system in a transit environment, using
the most advanced technology in the world. The key features of the system are:
˙Fully operational redundant configuration

˙Distributed system architecture
˙Reliable radio communications

˙Ease of adaptation to scheme plan or track layout changes

˙Automatic Restart (Train Registry System)
˙CITYFLO Monitoring System (CFMS)

˙Industry standard interfaces
˙Low life cycle costs

1.2 Increased Safety
The CITYFLO 650 solution uses checked redundancy to maintain or improve safety compared
to traditional train control equipment. Inexpensive to install, the CITYFLO 650 solution eliminates
wayside equipment due to its simple, reliable contact-less train-to wayside communications systems,
thereby permitting shorter, more consistent headways.
The system uses the EBI Com radio block centre which detects trains through the position sent
by the radio and controls the EBI Switch point machines. EBI Link wayside equipment ‘tags’ are
used as norming points to correct position measurement errors.

The EBI Cab onboard ATP ensures that the train does not exceed the permitted speeds or
violates the end of a movement authority.
1.3 Automatic Startup（Train Registry System）

In traditional CBTC systems, at cold start-up or after a complete shut-down due to failure, the