ABSTRACT
It is important to subdivide control command and signalling into three components, which are constructed and verified against applicable requirements separately: signalling, control command, and communication. All three play their role in providing active safety in railway transport. All three are interacting between each other and additionally with operational rules and procedures supporting safety related railway staff. Chapter six describes different types of signalling solutions showing their applicability and role in ensuring safety. In respect to signalling description is focusing on interlockings and line block systems, which are being certified only according to Polish requirements. In relation to control command both European and Polish requirements are applicable. HSL and HS vehicles must be equipped with so called class A system, which is a unified European solution known as the European Train Control System ETCS. The HS vehicles must be equipped, and HSL may be equipped, with so called class B system, which is a Train Braking System SHP in case of Poland. Chapter describes control command classes, which are based on contribution to safety. SHP and ETCS are assigned to respective classes. Class A control command system is shown not only generally but also pointing application levels and configurations together with recommendations regarding their use. Chapter six does not describe communication component as it is described separately in another chapter, however it describes communication interfaces, which are important for signalling and control command components.
