On 19 Feb, 11:56, wrote:
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?

Presumably that would reduce the chances of them failing to lock at
the expense of increasing the chances of them locking in the wrong
position.

Ganesh