- Start adjusting the tension on tracks starting in March when it gets warmer
- Use more expensive concrete sleepers where high forces appear (as TFA mentions)
- Cool exceptionally problematic parts of the track with water from tank cars
So in summary:
- spend money
- spend money
- spend money
That could explain why Network Rail isn't keen on doing any of that.
[0] https://company.sbb.ch/de/medien/dossier-medienschaffende/so...