If you pick the right size of wire and tubing, it should hold by friction. You might put a slight bend in the tube to make it tighter, but don't kink the tube.
The ones I've seen run it to either a ground throw or a switch machine or an apparatus like a G scale switch tower. (I hang around with the British modellers)
I work on one layout where we have the Caboose industries ground throws and despite their being oversize, we pull them apart regularly.