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The freight train stalled on the helper grade before the crew could add two additional locomotives.
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The freight train stalled on the helper grade before the crew could add two additional locomotives.
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Related words
helper grade
Noun
US
Japanese Meaning
（鉄道用語）主要な機関車の牽引力だけでは十分でなく、追加の補助機関車（ヘルパー）が必要となる急な勾配部分。
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