American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 64)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-59 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

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.

9.4.3.6 Broken Rail Detection

Broken rail detection shall be provided throughout. A broken rail shall de-energize the

associated track circuit.

9.4.3.7 Route Setting

There shall be three methods for control of train movement through the signalized sections.

9.4.3.8 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).

In normal operation, routes shall clear automatically for consists without intervention by the

train operator. At terminal stations the train operator shall be able, via TWC, to request that

the departing signal be cleared for the train to proceed. Trains shall be normally routed

reverse across before reaching the station as the preferred route, or the normal direction

route if the preferred platform is occupied.

The ATC system shall use train ID, transmitted by the TWC system, in order to

automatically route trains at junctions and turnback points for their designated route.

Fleet, if implemented, shall be provided for the normal traffic direction only.

9.4.3.8.1 Selection of Routes from the Train

Train-to-Wayside Communication route selection shall be provided at all interlockings, and

at terminal stations.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 64