bull rail 中文意思是什麼
bull rail
解釋
護壁材-
Specification for railway turnouts for private users - medium grade turnouts over which british railways locomotives do not operate, for axle loads not exceeding 25 tons - turnouts using bull head rail
私營鐵路道岔規范.第3部分:英國鐵路機車不運行的軸負荷不超過25噸的中型道岔.第1節:工字鋼軌道岔
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