American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 62)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-57 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

For safe braking calculations to bumping posts, the overhang distance of one vehicle (15

feet) can be used for distance D

9.4.3.2.4 Civil Braking Distance Calculation

CBD = D

+ D

, where:

= Reaction distance in feet = (CSS) x R x 1.467

= Braking Distance in feet = 0.733 x (CSS

-V

) / (B  0.2G)

CSS =Cab Signal Speed (mph) prior to braking.

V = Target speed at speed restriction

R = Reaction time in seconds (includes operator, cab signal delays and brake build-up) =

4.0 seconds.

B = Safe Braking rate = 2.0 mphps

G = Alignment grade as a decimal fraction

The target point for achieving the speed reduction shall be the tangent-to-spiral point on

curves and the point of switch for turnouts.

Civil speed restrictions shall be maintained until the rear of the train is clear of the

restriction. For curves, this shall be the curve-to-spiral point.

9.4.3.3 Cab Signal System

9.4.3.3.1 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.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 62