EULYNX is a European initiative in the area of railway signalling, with the aim of reducing the cost and installation time of signalling equipment. Currently, there are 12 members from North and Central Europe, with baseline 1 published in March 2017 and baseline 2 published in December 2017. The project documents lay down a system architecture for interlocking systems, including standard interfaces for the individual interlocking components, that can be used in any of the participating countries. The objective is to turn interlockings into modular systems, where different parts of one interlocking can be supplied by different manufacturers while maintaining the high safety and reliability levels required of a critical railway safety system.