The long term solution may be to reduce the need for overhead cables or get rid of them all together. It was the height of the cables that caused the scandal with the trains South Africa bought that were too tall. Removing the cables would not only solve that issue but cable theft too.

The solution is to use hydrogen and a fuel cell in the same way a diesel electric train operates, rather than diesel to run a generator, the hydrogen fuel cell generates electricity, is silent and only produces water as a by product. 

The range for the current versions is about 600km. That would still need some hydrogen stations to be created along the route for cross country trips but they may be run by solar plants that can create hydrogen from water or simply moved there by train. 

Image credit: Casey Horner Unsplash