None of those are state capacity issues.
Those are "State is pointing a gun at anyone who would fix them" issues.
Friendly reminder that 95%+ of the UK railway system was built by private for profit companies, with state involvement being primarily limited to not preventing it from happening.
All of these issues are 100% self inflicted by the state getting in the way.
All that needs to happen for them to fix themselves is to stop actively preventing private individuals from fixing them.