American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 88)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-83 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

6. Emergency Braking Distance is replaced by Service Braking Distance.

7. Service Braking Distance - The distance traveled from the point at which the

service brakes are fully applied and the train begins to decelerate at the worst-

case net braking rate of 2.0 mi/hr/sec to the target speed. The braking rate shall

be 2.0 mi/hr/sec for the entire interval. Adjust deceleration for track geometry.

9.4.5.4 Cab Signal System

9.4.5.4.1 Functionality Overview

The cab signal received on-board the car shall be interpreted as a speed limit, the aspect of

which, shall be displayed to the operator.

Code rates and their meanings shall be:

The carrier frequency shall be 2.34 kHz.

Dead sections, such as at insulated rail joints, shall be no greater than 14 feet in length.

9.4.5.5 Train Detection

The signaling system shall detect all cars operating independently or in consist, and any

other rail vehicle present, except hi-rail vehicles.

The presence of a rail vehicle in a section of the route shall be detected continuously by

means of track circuits.

Detection of the occupation of the track circuit shall be fail-safe, such that a de-energized

position is interpreted as an occupation of the track circuit.

In the event of a temporary loss of detection, the design shall ensure that indication of the

presence of a rail vehicle in a section will be maintained while a rail vehicle is actually in the

section.

If a rail vehicle is parted in an unscheduled manner, the signal system shall ensure that all

CODE RATE INDICATION

21.50 Hz Proceed at 70 mph.

18.10 Hz Proceed at 55 mph.

15.30 Hz Proceed at 45 mph.

12.43 Hz Proceed at 40 mph.

10.10 Hz Proceed at 25 mph.

8.31 Hz Proceed at 9 mph.

6.83 Hz Proceed at 8 mph.

5.50 Hz Stop and Stay

No Code

Stop and Proceed. Approaching a signal at stop or

when occupancy exists ahead that requires

immediate brake application to safely avoid a

collision.

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 190 191

No comments

American Audio VELOCITY - REV 4-05 Operations Instructions Page 88