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The Safety Critical Systems Handbook, 4th Edition by Kenneth L. Simpson, David J. Smith

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Chapter 14

Hypothetical Rail Train Braking System (Example)

Abstract

This chapter briefly discusses a combination of two safety-related systems in Rail Train Braking. Respective SIL targets and failure rate data are also covered.

Keywords

Air pressure; Emergency braking; Failure rate data; High demand; Low demand; Primary braking
 
The following example has been simplified and, as a consequence, some of the operating modes have been changed in order to maintain the overall philosophy but give clarity to the example.

14.1. The Systems

In this example we have a combination of two safety-related systems. One is a “high-demand” train primary braking system, together with a second level of protection consisting of a “low-demand” emergency braking system.

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