Points machine detection

[PJW]

Many thanks PJW for your input, I like to learn different inputs so it can never be more than I wanted to know, but I found it quite funny the point you made about signallers saying "detection." I used to be a points operator on weekend possessions, and when it came to given the worksite back I would obviously go out and make sure that all sets of points are normalised and powered back up, and when I went through the process of handing them back to the signaller I have always found they say 'detection,' and never heard them say 'correspondance.'

So is it right in saying in layman's terms that correspondance is the last phase of this process.

Certainly in the sense that the contacts at the points are individually detecting individual bits of the points and these are then summated to form the detection for an entire point end and then an entire point number but by the time it is used within tthe interlocking it is almost always correpondence and the end result when the signaller gets an indication then it is most certainly correspondence (even though it is often referred to still as "detection")