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On Platforms they should be fitted every 10 metres along the face and at the Ramp top.
On curved platforms they may be fitted at 5m intervals.
The Red Block may be changed to a Green block at some locations.
This is when instead of either being installed to a standard clearance or to what is existing now.
The block will be green when the track alignment has been designed specifically for that location and may be tighter than a standard clearance figure.
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