American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 55)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-50 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

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 automatic gate activation prior to train

departure. TWC shall be provided to cancel crossing activation and to reactivate the

crossing.

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

extend the approach time to take account of the delay in dropping all gates. All gates shall

be individually monitored.

Crossing bell shall be an electronic type, conforming with AREMA Signal Manual, Part

3.2.61. The bell sound level shall be set to 77 dBa ±2 dBa at 10 feet in accordance with

AREMA Signal Manual, Part 3.2.61, unless ambient noise levels dictate otherwise. Where

an electronic processor is used for the crossing equipment, the design shall be such that the

end user may elect, by means of external wiring alteration and without logic redesign, to

silence the bells once all gates are horizontal. Such design shall prevent the bells from re-

activating as the gates rise.

Provide an 8-inch amber LED Motorman's Signal for each track, located on the normal

approach side of the crossing and facing trains approaching in the normal direction of traffic.

Each Motorman's Signal shall display a solid aspect when the crossing approach is

occupied and a flashing aspect when the gates are down and there is no detected

malfunction of the crossing system

9.4.2.12 Track Switches

All track switches shall be powered and interlocked. They shall normally be set and locked

automatically. All route-setting functions shall apply. An over-switch (OS) track circuit shall

be provided, occupation of which shall prevent powered movement of the switch.

A manual switch setting facility shall be provided at powered switch locations. The placing of

a powered switch into manual operation shall result in loss of indication. Signals shall revert

to their most restrictive aspect in the event of loss of indication of switch position.

Switch and lock mechanisms shall meet or exceed the recommendations of the AREMA

Manual of Recommended Practices–Signals. The electrical, electromechanical or

mechanical locking equipment shall prevent switch point movement when the switch points

are in full normal or full reverse position. Three-phase operated switch machines shall be

avoided unless exceptional site conditions (e.g. distance from control point) dictate use of

same.

Parts of switch operating layouts shall be interchangeable between similar layouts.

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