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4 Stopping distances V Max Service break 750m G S60 750m G TA m P S m G S m G TA Longitudinal forces Emergency % Tract FU30 FU30 Linear Tail loading Loading -33.9% -8.4% -45.5% -34% -5.3% -41.5% -29.8% -33.1% -27.7% However the awaited profits are very variable and depend : Of the train length. Of its heterogeneity in loading. Of its composition. Of braking mode : service breaking or emergency breaking. The results of simulations show that the behaviour of a train with a length close to 1000 m equipped with the DAF is identical to a 750 m long train without DAF equipment. Realization of a prototype system Finally an entirely pneumatic prototype system has been constructed. It should be understood by entirely pneumatic the fact that the system does not need electric power to achieve its breaking functions. But some additional functions using very little energy can be added easily on this equipment (because designed for this purpose), and in particular monitoring function and electro pneumatic redundancy if the pure pneumatic part has suddenly broken down. Not to modify in a significant way the conditions of exploitation, in particular at the time of the formation of the train, the equipment was integrated into an end of train lantern, and the unit does not exceed the mass of 10 kg. The photograph here after shows a specimen of this prototype system.

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