The 408 Taroko Express, carrying 498 passengers including drivers and TRA staff, crashed inside a tunnel near Hualien city at 9:28 am on April 2. The derailment led to 50 people killed and more than 200 injured in the accident.
According to early indications, a maintenance vehicle unexpectedly slipped down onto the railway track. There was not enough time and distance for the Express to respond and stop but to hit on the truck and then crushed against the wall of the tunnel. The construction site manager, meanwhile the driver of the truck, has been detained for questioning. The crash was the worst train disaster in decades in Taiwan.
4月2日上午9點28分，包括司機及台鐵人員（Taiwan Railways Administration, TRA）總計搭載498名旅客的台鐵408車次太魯閣號，撞毀在花蓮附近的一座隧道中。這次的出軌意外造成50人死亡、超過200人受傷。
依據初步的跡象顯示，一輛在附近的維修工程車意外從山坡上滑落到鐵軌上。經過彎道後接近的太魯閣號，沒有足夠的時間和距離反應並煞車，於是撞上工程車。工地主任同時也是貨車駕駛的工程負責人李義祥，已經被羈押進行訊問。這起撞擊意外是台灣數十年來最嚴重的火車事故。
rail (n.) 常見的意思是「鐵軌、軌道」，go off the rails延伸成抽象的意義就是「舉止脫離常規、行為不軌」。以de-開頭的字首（prefix）有「除去」的意思，因此derail就是「脫離軌道、出軌」的動詞，derailment則是「脫軌」的名詞。
例句：
A small rock might lead to a train derailment. 一顆小石頭也可能導致火車出軌。
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