hmmn yeah I imagine in the canyons the radios may have a range of 1-3 miles at best. will have to see how they do on Mines. One idea is that if we have cars with radios in the middle, they act as repeater:
Lead car: "Slow down, cow on the roadway"
Middle Car: "Roger that, slow down cow on the roadway"
Tail car: "what? Hamburgers?"