to exit
rails
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→chu1gui3 • chūguǐ
to derail
derail, derails, derailing, derailed, derailment
This is often used figuratively as well.
出轨 的 火车 阻塞 了 铁路。
The derailed train blocked the railway.
火车 今早 出轨 了。
The train derailed this morning.
火车 因为 铁轨 上 的 碎片 而 出轨。
The train derailed due to debris on the rail.