I know this is the speculative section, but re-engineering Voyagers? Really?
Any new engine would have to meet the current emissions standards which the existing ones don’t have to, which makes finding one that would fit difficult. Coupled with that is the ban on diesel only trains in 2040, so it’s not as if a new engine would give a longer life. By that point they’ll be 35-40 years old which is a decent run for most rolling stock. There’s still plenty of places that need self powered long distance rolling stock for the foreseeable future so they’re not going to go in the bin immediately.
Any new engine would have to meet the current emissions standards which the existing ones don’t have to, which makes finding one that would fit difficult. Coupled with that is the ban on diesel only trains in 2040, so it’s not as if a new engine would give a longer life. By that point they’ll be 35-40 years old which is a decent run for most rolling stock. There’s still plenty of places that need self powered long distance rolling stock for the foreseeable future so they’re not going to go in the bin immediately.