Treehugger
I found some bicycle wire at home. Not sure if this was shift or breaking wire: ibb.co/Ry4s41j (image upload)

Apparently, the resulting ca 1mm thickness after stripping, seem to match the cable on my 1:35 Challenger tank. I think I will replace the tread I used for cable material with this new wire. 🙂

OBSIDIAN CRAB
Yes, that's shift cable. Brake cable is thicker gauge strands, and doesn't have two layers. Remember to anneal the wire so that it's soft. Heat it to glowing, and let it cool slowly. Then you can work it around corners and give it a natural sag in places.