TOSU/LKJ is used to supervise speed limits and can only advise train drivers on braking curves.
[3][4] For railway lines where operational speeds are below 160 km/h (99 mph): Balises are installed in addition to track circuits.
Temporary speed restrictions, train positions and track data are provided intermittently.
For high-speed railways where operational speeds are below 250 km/h (160 mph): The track circuit is used both for train occupation detection and movement authorization, its architecture is similar to TVM-300.
[4] Balises and track circuit serves to provide intermittent trackside information and automatic train protection (ATP) to cab equipment.
For high-speed railway of above 250 km/h (160 mph):[4] CTCS-3 introduces GSM-R radio for bidirectional data transmission.
Train positions can be accurately calculated using balises and onboard odometers which are transmitted to Radio Block Centres (RBCs).