The gaps in the overhead are not an issue as the coal trains have distributed power.But we are in Australia. Different rules apply! If there is a way to make things more difficult, we would run with that.QR has gaps in the overhead across some roads to allow for high loads on roads in the coal network. Considering 100,000's tonnes per day of coal run across these gaps, I'd say its a no brainer.
So there are always locomotives under power.