Faster trains are great, it would be great to convert my existing trains rather than destroy and rebuild each of them. Is it possible to use an "upgrade" planner to automatically upgrade from classic to supersonic, or upgrade from one kind of supersonic to another?
did u try the upgrade planner in vanilla ?
also maybe if u try to replace them like belts it might work , i need to do some tests abotu this
and no it is not possible to change on in another
there were some mods that auto crafted trains , u can use that and then copy the route from old one to new one
