yes, there is an open side to where you can see the cable. but theyre not just resting there. theyre clamped down. theres a spring you can see on there, not sure how much holding force it puts out, but the lift arms arent just sittin on the cable. when you hit a station, the clamp releases and goes on track. when ts put back on the cable, it clamps back on.
im pretty sure thats right