CBTC for the main lines
CBTC Systems

The question is whether ERTMS can be considered as a CBTC and whether ERTMS could be used in urban transport systems. For a description of ERTMS, see "Technical Specifications for Interoperability (TSI)" on the website of the European Railway Agency (ERA).

ERTMS level 1 cannot be considered as a CBTC because there is no continuous transmission between the infrastructure and the mobiles.

The architecture of ERTMS level 2 is that of the