American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 76)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-71 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

prevented when track occupancy is detected in the track section in which that switch is

located.

The switch locking function shall have 5 seconds loss of shunt protection. However,

sectional release shall be provided where practicable, to support headways through

junctions.

Any failure, including loss of power, to any part of an interlocking shall not result in the

premature release of any locking function.

9.4.4.8 Public Highway Crossings

9.4.4.8.1 General

Activation of grade crossing warning devices shall be normally achieved by all rail vehicles

using the main line, but excluding hi-rail vehicles.

9.4.4.8.2 Highway Crossing Warning Activation

Warning devices shall normally be automatically activated by the approach of a rail vehicle

with a nominally uniform warning time. The devices shall be direction sensitive, and shall be

activated by the approach of a train on any track from either direction.

The Crossing Warning time shall be able to be adjusted between a maximum of 30 seconds

(or greater if city requirements demand such) and a minimum of 20 seconds. The

calculation of the exact warning time shall be done for each crossing according to CPUC

GO 75 and AREMA Signal Manual requirements. Advanced Pre-Emption shall be provided

where required to clear traffic queues and provide sufficient time for adjacent controlled

intersections to configure for crossing activation.

The design shall assume all trains stop at all stations for the purposes of setting Advanced

Pre-Emption and Crossing Warning times. Where the start of a Crossing Warning extends

to, or through, a station the contractor shall ensure, by means of cab signal code, that a

train that fails to make a station stop cannot enter the crossing before the entrance gates

are lowered. However, reductions in cab signal code to enforce minimum warning time shall

not be implemented earlier than necessary. The goal shall be for such code reductions to be

invisible to a train making a normal station stop.

Where a crossing is in advance of a station such that a minimum time cannot be given (after

departure from the station), the crossing gates shall remain inactivated. If the operator does

not stop, the gates shall be activated and the signal system shall impose a speed reduction

or STOP code to ensure the train cannot enter the crossing before the entrance gates are

lowered. The design shall provide a system for gate activation prior to train departure. This

system shall be by means of TWC.

The warning devices shall remain active until the crossing is cleared totally. These grade

crossing systems shall be designed and installed in accordance with applicable

Governmental Rules and, the recommendations of the AREMA and Manual of Uniform

Traffic Control Devices (MUTCD).

Where a 4-quadrant full-closure gate arrangement is required, the design shall arrange for

the leading and trailing gates to operate as specified in CPUC GO 75. The design shall

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 76