Yes, I used the bike brake cables. In thought I would need a spring, but in fact they work near perfectly (in my scenario). I’m assuming that there is a natural spring, or ’give‘ in the cable that allows for the flexibility needed. As I said, I’m happy with those that I have. However I have also got a choke cable and have been experimenting with it in my workshop. So far, I haven‘t found it to be as simple as my current set ups, but early days. I can see this may be more appropriate for an elevated ‘set up‘ area that hasn’t yet been built.A question, Fred suggested "choke cable" because the center is solid and it will push as well as pull.
It looks like you used bicycle derailleur cable, which is a braided, twisted center, which pulls fine (although stretches a bit under high loads), but does not push as well.
Without a spring return at the switch, I would think that the "push" direction might not be as "positive" as the "pull" direction.
Just curious, I understand you already stated it works well.
I’ve got six turnouts controlled by the brake cables. Two of these turnouts are controlled by one barrel bolt, and even that (much to my surprise) works fine, They have all been outside and working for a year now. They’ve been through a Northwest Florida year with very little maintenance, which was my aim in the first place.