Yu says, "Modern environmental laws are strict. The black smoke that steam engines belch out doesn't meet legal standards. For special events, it's not such a problem, but there would probably be protests if we used the engine regularly."
「現在的環保法令嚴格，蒸汽火車所冒出的黑煙往往不符合標準，特殊活動進行較沒問題，常態行駛民眾可能就要抗議了」，余春榮說。