Radio and communications-based train control: Migration, interoperation and system engineering issues

CBTC is now the technology chosen by many transit operators worldwide. As operators target efficient train operations, they also take the opportunity of the change to CBTC technology to ask for improved performances and for the integration of more constraints. This paper presents these enhanced requirements and constraints and the ways in which advanced engineering solutions help to deal with these as well the varied operating conditions now found in urban environments.