Software Safety Assurance Process for Railway Platform Software

The SIL 4 railway platform software will provide common support to the different applications software like automatic train protection, automatic train operation and Interlock software. The safety assurance process is important for SIL 4 platform software. This paper presents the safety process that will ensure that the software complies with CENELEC EN 50128 standard. Typical analysis techniques to be applied during each phase of the development of the railway platform software are shown. The implementation of this plan will ensure that the software safety requirements are verified and demonstrated as having been met in support of the application for approval of the Software Safety Assessment (SSA) Report by the ISA (Independent Safety Assessor) approval body.