American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 54)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-49 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

d) Approach locking - Approach locking shall lock switches within a route governed

by a cleared wayside signal to prevent clearing wayside signals for opposing or

conflicting routes.

e) Time locking - Time locking shall ensure that all switches and signals forming a

route, and those protecting it, remain in position and locked for a predetermined

time after the entry signal has been caused to display its most restrictive aspect

again.

f) Traffic locking - Setting and locking of a route shall be prohibited unless the

opposing signals show the most restrictive aspect. The signal system shall

furthermore prevent any trains simultaneously entering the same block section

from different directions or tracks.

Independent of any route locking function, the movement of any powered switch shall be

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.

9.4.2.11 Public Highway Crossings

9.4.2.11.1 General

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

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

9.4.2.11.2 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.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 54