John Rowland wrote:
"TheOneKEA" wrote in message
ps.com...

"Bobbing" is when the signal rapidly changes
from aspect to aspect without warning or reason.

Naturally this is a major problem because a signal
could bob despite an occupied track in front of the
train; thus, if it goes to green and the driver passes
it in the correct way at speed, CRUNCH.

I doubt that, because it would violate the concept of "failsafe".


Maybe, maybe not. If the signals are bobbing at all then you have a
problem; under the right circumstances, a soaking wet relay cabinet
would probably produce a wrong-side failure. Knowing very little about
signal design I can't say how likely it is to happen.