ATP "release speed"

[Peter]

Hi Signalling engineers:

Recently, I am reading article about the ATP system "An Introduction to Intermittent and Continuous ATP System" and in the content it has introduced the term "release speed" for ATP system, but I don't quite understand it.

I have looked through website, but has not yet found anything about it,so can anyone explain what is "release speed" in ATP system and does it have anything to do with the overlap for ATP ??

thanks

With an intermittent ATP system the train will get be told to stop and will not be able to start again becuase it does not get the update until it passes the signal.

The release speed allows the driver to obey the aspect and allow the ATP to get the required update. If the driver does this in error, a SPAD will be detected and the train brought to a stand, hence the release speed is dertermined by design of the conflict point. This could be seen as an ATP overlap (I think it gets called this in the ERTMS application).