Hi
I am building both a C and M track layout.
On the C track I am in the process of setting up an automatic 3 train single track circuit, thanks to invaluable assistance from “ The Third Rail”. I decided to treat myself with C track signals, only to be told you cannot operated them from switching track 24994.
Have been told I could use Viessmann 4600 signals, if I can find them. So it seems I will use traditional M Track signals, wired the same way .
So my question is what are C track switching circuit track used for, just turnouts
Your views appreciated

Hi
Märklin has decided that its latest signals would be ONLY digital (unlike Viessmann ones)
So indeed you cannot sonnect directly a C Track signal (e.g.:70393) because you don't have analog inputs to change the signal.
Using a CS3 (or CS2), it is possible to connect a switching track like 24994 to the CS3 using an M88 input unit to trigger a signal red or green. It works well.
This is not the best way because not very secure as it works using impulses generated by sliders.
The best way by far is to use occupancy (one of the rails is insulated and detects if a length of track (one or many meters) is free or not.
Viessmann signals can to both be in digital or be used as an analog signal

What does change between C Track and M Track? Nothing except that M track does not really allow to have long streches or insulated track for occupancy except using the special tracks for train detection on level crossings.

Note: some model fans have transformed ANY type of M track into an insulated one. This is about removing one of the rails and putting it back after having it envelopped into a black shrink tube, closing all the rail attachments and cutting the upper part of the heath-shrink tube
Cheers
Jean