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火車轆喺形狀上有特別嘅設計(可以睇附圖嘅圖解),一個轆喺入面嘅圓周明顯大啲,而喺出面嘅圓周就明顯細啲,呢種設計幫到手確保架車冇咁易出軌。事實係,啲工程師或者第啲工作人員檢查一架火車嗰陣,梗會睇吓啲轆嘅形狀係咪正常-如果有轆因為摩擦力摩損而形狀變咗,就有機會搞到架火車出軌,出軌可以造成嚴重嘅人命財產傷亡[1]。
啲人設計同檢查火車轆嗰時,成日會留意溫度相關嘅問題:事實表明,一架火車行嗰陣時,佢啲轆會承受極大嘅力-除咗架火車嘅重量之外,仲有係啲轆同路軌之間嘅摩擦力,呢啲力實會產生咁上下量嘅熱;而且有工程學研究報告指,當一架火車耷
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