American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 51

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-46 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
9.4.2.4 Train-to-Wayside Communication
The Train-to-Wayside Communication (TWC) system shall be compatible with Hanning &
Kahl HCS-V.
TWC transponders shall be provided at the following minimum locations:
Approach to all wayside signals
At stations with near-side at-grade crossings
At the terminus station (for calling of a route onto the main line)
9.4.2.5 Train Detection
The signaling system shall detect all cars operating independently or in consist, and any
other rail vehicle present, except hi-rail vehicles.
The presence of a rail vehicle in a section of the route shall be detected continuously by
means of track circuits.
Detection of the occupation of the track circuit shall be fail-safe, such that a de-energized
position is interpreted as an occupation of the track circuit.
In the event of a temporary loss of detection, the design shall ensure that indication of the
presence of a rail vehicle in a section will be maintained while a rail vehicle is actually in the
section.
If a rail vehicle is parted in an unscheduled manner, the signal system shall ensure that all
parts of the rail vehicle are detected. The signal system shall ensure that safe separation is
maintained between the parted vehicle and all other rail vehicles.
The minimum effective length of a track circuit shall be longer than the maximum inner
wheelbase of all vehicles used on this track.
For track circuits used to control signals and locking functions, including grade crossing
activation devices, the minimum shunt sensitivity shall be 0.25 Ohms. The shunting
requirements shall be met for ballast conditions of 5 ohms per thousand feet or greater.
9.4.2.6 Broken Rail Detection
Broken rail detection shall be provided throughout. A broken rail shall de-energize the
associated track circuit.
9.4.2.7 Route Setting
There shall be three methods for control of train movement through the signalized sections.
9.4.2.8 Automatic Route Setting
Routes shall either normally operate automatically by signal and switch control subsystems
responding to the approach of the train , or by use of a Fleet command (Metro shall
designate which shall be used for each interlocking).
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