Software in Strong state interlocking systems is designed at Saftey Integrity Stage four (SIL 4), since errors in software outcomes in loss of life and great property damage. Swallowed objects can puncture a cow’s stomach and injury its diaphragm or

Software in Solid state interlocking programs is designed at Saftey Integrity Stage 4 (SIL 4), since errors in software results in lack of life and great property injury. Swallowed objects can puncture a cow’s stomach and harm its diaphragm or