Just break it down into components parts, water tanks, coal bunker, cab, ect. Majority will be printed in resin so that the fine details will still show.
All the gray parts in this photo are resin, the white parts are pla filament. Filament is stronger but less detail, resin is great for details but can be brittle. When you are printing small scales, filament isn't an option but good if its 1:16 scale.