Do the plans for the Scenic Railway include fitting a fire suppression system (sprinklers)?
For a (relatively) low cost a sprinkler system would offer a substantial amount of protection and extinguish or contain any future fires.
Unfortunately it seems that the site is vulnerable (and will continue to be even after re-opening). It would be worth the redevelopment of the park to get
Secured by Design advice to help reduce vandalism or arson in the future.