is fully to day but due to the long time needed to install it on trains and the long lines existing national systems will to wit the lines
The system is fully operational today but, due to the long time needed to install it on board trains and the long lines, existing national systems will continue to coexist with ERTMS along the lines.
is fully today but, due to the long time needed to install it on trains and the long lines, existing national systems will to with the lines.