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Re: Ringwood

Yuri J Sos/Melbourne AUS wrote:

> >anti track-bobbing protection
>
> What is this, please? (sounds like some unsafe sex practice on the
> rails).

Sorry Yuri, nothing to do with safe or unsafe etc.

Track circuits are de-energised when a train is occupying it but for all
sorts of reasons sometimes they are prone to trying to pickup even when
a train is there. Normally it only picks up (if it does it at all and it
is fairly rare to see it but you have to guard against it anyway)
momentarily then drops again. This is known as a track circuit bobbing.
If a track circuit does pick up in these circumstances, it can do
dastardly things to the interlocking like releasing approach locking
etc.

David Langley.