On 2 July 2025, the State Railway Technical Inspectorate organised a training seminar "Authorisation to put stationary installations (APIS) into service” for representatives of the railway infrastructure manager, which examined the general guiding principles for the application of the APIS process and their need for further safety and interoperability of the railway system. Topics covered: EU legislation and national requirements. The railway system, its subsystems and their compatibility. Basic principles for the application of the APIS process. The conformity assessment stages of APIS. The role of the commissioning party in the APIS process and its partners. ERA registers and databases to be used. Decision on the application of APIS…