Table 1

SIL in railway signaling safety

Safety integrity levelSeverity level of hazard consequenceRailway accident levelProbability of failure on demand (dangerous failure rate/h)
SIL 1InsignificantGeneral accident of class D10–5
SIL 2MarginalGeneral accident of class C10–7
SIL 3CriticalGeneral accident of class A&B10–9
SIL 4CatastrophicExtremely major accidents & major accidents10–11

Note(s): 1. The railway signaling system risk assessment of hidden hazards is based on the “Typical Example of Risk Evaluation and Acceptance” (EN 50126, 2017)

2. The railway accident level is based on the “Performance Criteria of Immunity” (TB/T 3073, 2003)

Source(s): Author's own work

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