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There is nothing wrong with using wireless for signalling (plane and shuttles must use wireless!)  The problem is in designing for failure modes.  The same applies to signalling - as DoDo mentioned, cable thieves are a problem just as devastating to signal strength as a failed transmitter.  Indeed, with sensible hardening wireless is probably safer.
by njh on Tue Aug 16th, 2011 at 11:39:41 PM EST
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Having read of sudden train stoppages for that reason, I used to think that unsteady signal reception is a problem due to a fail-safe requirement of constant signal reception. However, in ETCS L2, the train only stops if the signal loss is at the end of a movement authority (in practice: at a block limit/signal), and there are software patches for both momentary and local wireless signal loss; and these seem to be working as the present ETCS L2 problems seem to be unrelated to signal reception (also see a commenter in one of my diaries who specialises in ETCS and denied that signal reception is the problem).

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Aug 17th, 2011 at 09:45:52 AM EST
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