Passage control for ERTMS/ETCS level 2 implementation on railway lines with mix traffic

Abstract

Currently the ERTMS/ETCS level 2 system is implemented on the polish railway lines. On all railway lines where this system is implemented (or will be implemented in near future) there is a mix traffic. It means that both equipped and unequipped with ETCS system trains shall be considered from command and control system point of view. This article presents issue related to the function of passage control in the system and its proper design for fulfill availability and safety requirements for mix traffic signaling.