American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 53)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-48 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Aspect Meaning

Red/Green Block occupied. Proceed on diverging route with Cab Signals.

Trains without Cab Signals or operating with ATP Bypass

activated shall STOP and contact ROC.

Flashing Red/Red STOP and contact ROC. Proceed indication cannot be

displayed. When authorized by ROC, proceed in Stop and

Proceed mode on Normal Route.

Red/Flashing Red STOP and contact ROC. Proceed indication cannot be

displayed. When authorized by ROC, proceed in Stop and

Proceed mode on diverging route.

Indication on signals or switches shall be fail-safe, such that no less restrictive aspect is

shown than intended. “Block Clear” aspects shall not be used in street-running areas.

Wayside signals shall be located such that they are sufficiently visible to preclude confusion

with signals governing the operation of motor vehicles, and similarly do not confuse motor

vehicle drivers. When viewed from a height of 7 feet above top of rail, at a distance of 500 ft,

lenses shall present a distinct aspect under the most adverse operating conditions.

Provide a signal number plate for each signal. The signal number plate shall be placed

under the lowest signal lens in the assembly. Signal plates shall meet the requirements of

the AREMA Manual of Recommended Practices – Signals. The alphanumeric characters

shall be a minimum of 3 inches high.

The top of the top-most aspect shall be set at 5’-5 3/8” above Top of Rail or as approved by

Metro.

9.4.2.10 Interlockings

As a minimum, the following locking functions shall be provided for powered switch

interlockings:

a) Switch locking - A locking function shall ensure that a signal governing a switch

or combination of switches shall only show a less restrictive aspect than "stop",

when all switches are in the correct position.

b) Automatic Block locking - A home signal governing a block shall only show a

less restrictive aspect than “stop”, when the entire block is unoccupied by any

trains or vehicles. This shall be controlled automatically by means of track

circuits throughout the entire block.

c) Route locking - Route locking shall lock switches within a route after a signal has

been cleared for train movement onto that route, and shall prevent clearing of

opposing and conflicting signals within the interlocking. Route locking shall be in

effect when approach locking is in effect, and it shall remain in effect until the

rear of the train has cleared the route.

Switches, which are part of the route, and switches or signals, which are protecting

against flanking, shall be disabled from moving when the route is locked. Signals

protecting this route shall be prevented from showing aspects other than stop.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 53