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The safety of railway signalling systems depends on the correctness of the programming of a logical controller known as an interlocking. Assurance of correctness is usually achieved by a combination of testing, both on simulation systems and on the target hardware, and manual or tool-assisted checking of the data, with use being made in some cases of techniques of static analysis and formal methods...
The basic principles and lessons learned from the cross-acceptance of signalling equipment in that era are presented here for typical products of the rail automation division of Siemens transportation systems in accordance with pre-CENELEC era regulation. The EN 50126/1/, EN 50128/2/ and EN 50129/3/ standards describe the requirements for the safety-related hardware and overall system. The future...
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