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88 Jeffrey S. Stover CITYFLO 650 System Overview

data of its own to the trains.

The TWC equipment includes the Radiax, BDR, Distribution Amplifiers（not shown on the
overview in Fogure 1）, Mobile Antennas（on board the trains）, and the MDR（Mobile Data Radio
on board the trains）. Data is transferred through the MDR to and from the Vehicle ATP（VATP）.

Note that “Line of Sight” antennae can be used instead of the Radiax to provide RF
distribution; the decision to use one system or the other is determined during the design process
based on the application and specific site / customer requirements.

3、CITYFLO 650, Special Concepts / Features

CITYFLO 650 is a “true Moving-Block” system and there are several concepts and features,
unique to the CITYFLO 650 system, that differentiate it from the other DTO/UTO systems
available.

3.1 The CITYFLO 650 Segment and the Modelling of the Track
In Communication-Based Train Control, Moving- Block systems, as well as in all
“contactless” train control systems, there are no track circuits to provide information to the trains or
occupancy from the trains. CITYFLO 650 models the tracks using the entity called a “CITYFLO
Segment”, which is defined to be a section of track that is defined by a set of unique values in:

˙Grade
˙Speed
˙Platform Location
˙Switch Location
˙Region Boundary
˙End of Line
˙Emergency Walkway Location
˙Underlying Fixed Block Locations

The following figure provides an example of the segment layout of a simple CITYFLO system.

Figure 4：Typical CITYFLO Segment Layout