More than half a century has passed since steam locomotives, even the newest ones were manufactured, so in future the cost for preservation/maintenance will increase at an accelerated pace.
蒸気機関車自体、製造されてから、最も新しいものでも半世紀を優に超す車齢を刻んでおり、今後、加速度的に保存・維持費は跳ね上がっていく。