TVM (Automatic Train Control)

TVM 430 is the second generation of TVM based on vital computer techniques and sophisticated multiplex frequency coding for track to train transmission through the rail.
 
The Headway performance can be achieved under commercial condition at 3 min. for 320 km/h. This system can be delivered in an integrated configuration ATC/IXL (Automatic Train Control/Interlocking) named SEI which reduces the cost by using the same computer platform for ATC and IXL.
 
TVM 300 is the first generation in service since 1981 and based on analogical technique.
 
It is extremely reliable and competitive in terms of price per kilometer. The TVM 300 used on the South East HSL in France, allowed a headway of 5 min. between trains. This was reduced to 3 min. on the new high-speed lines due to the use of the TVM 430.
 
Safety
 
TVM systems ensure the continuous control of the train. In the event of  speed excess in relation to the instruction speed, the control automatically triggers the braking system. Information coming from the track, train location and local parameters processing is continuously transmitted to the monitoring equipment situated in the locomotive. The TVM generations use the rail as a way of transmission medium with a sophisticated multiplex frequency for coding.
 
The principle of a continuous ATC system (Automatic Train Control) is to allow real time transmission to the train of all information necessary to its movement and to check that the train evolves within its assigned safety parameters at all times.
 
 Availability
 
More than 4 million kilometres are run each month in France using TVM 430, guaranteeing less than a 5 min. delay every 2 million kilometres.
 
 
* The TVM comes originally from "Transmission Voie Machine" (track to train transmission), however today the contents of the concept include vital automatic control systems.