American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 90

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-85 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
Aspect Meaning
Flashing Yellow Proceed on diverging route into reverse traffic.
Yellow Proceed on diverging route into normal traffic.
Flashing Green Proceed on normal route into reverse traffic.
Green Proceed on normal route into normal traffic.
Indication on signals or switches shall be fail-safe, such that no less restrictive aspect is
shown than intended.
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.
9.4.5.11 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.
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
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