>
>OK, now that the irrelevancies about speed proving in Victoria is
>over..... again, does anyone know for certain what role these boxes
>play? Since they do not line up exactly with the train stops, in some
>instance being some distance beyond the previous train stop, the
>relationship between train stops and the boxes is not immediately
>obvious, except that it appears to be 1 to 1.
>
>While they may well be induction sensing devices, which box relates to
>which train stop, i.e. one ahead, two ahead or whatever?
They are just part of the track circuit devices corresponding to the various
timing tracks. Each trip is timed depending on the train's speed over a
selected approach distance, which naturally does not (or need not)
coincide exactly with the section from the previous trip.
Look for the positions of the insulated joints (I think, but have
not looked in the very latest installations, that the track circuits here are still
the insulated joint types rather than the jointless variety which may be less
suited to the locational precision required for these timing tracks).
Eddie Oliver