wrote in message
...
On Feb 19, 11:41 am, Mike Bristow wrote:
Often, the root cause of the signal failure is a failure of the
points locking mechanisim (or the magic that tells the signalling
system it is locked).

Fair enuff , I didn't know that. Perhaps it would be too expensive but
couldn't each set of points have a backup locking system?

B2003

Another thing is that the affected points are not always immediately in
front of the driver and could be round a bend or 300 yds further up which he
is unable to see, and one signal may be linked to a total of 3 "sets" of
points before its able to turn green and any one of the three may be the
problem. He wont know which ones are causing the problem.