stop braking, and the red LED will disappear. The exit speed, which has to be reached when the movement authority ends, is displayed by a dot-matrix below the speedometer. An illuminated bar next to the speedometer shows the remaining distance until this speed has to be reached. When the exit speed is the same as the current speed the bar will remain dark. If the movement authority ends before the next beacon is reached, the train can continue with a specified "release-speed", often 30 km/h, until it receives new authority from the next beacon. Flaws One weakness of the system is wheelslip caused by slippery rails. ATB-NG measures the traveled distance by counting the wheel rotations, the system will think the train is ahead of its actual position when the wheelspin occurs. This can result in premature brake interventions when approaching a red signal as the system thinks the train has already passed the signal, while it might still be several meters away. Another problem is the fact that ATB-NG can't react to signal changes. If a red signal clears ATB-NG will still force the train to stop and only let it creep forward until it reaches the next beacon. This issue can however be solved by installing ATB loops which enable the system to pick up signal updates in a stretch of track before the signal. An issue with the ATB-NG system as a product is the patent held by ACEC-Alstom, which limits other manufacturers to supply the system and the fact that it offers poor interoperability with other systems. Implementation The implementation is shown in the map above. Beside intermediately closing of functional gaps, new constructed lines will use European Train Control System (ETCS) as part of the assigned standard ERTMS. ETCS is already in use on Betuweroute line and HSL-Zuid. See also Pulse Code Cab Signaling Train stop – protects against signal passing at danger Automatic Warning System – protects against a) Automatic Train Protection – protects against b) Train protection system References Train protection systems Rail transport in the Netherlands