American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 66

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-61 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
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.
9.4.3.10 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.
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,
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