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1前言机车出、八段，是乘务员四个关键了望时机之一。这个时机中发生的行车事故在调车事故中占有相当的比重。据统计，从1990－1995年哈尔滨铁路局机务系统发生的222件调车事故中，就有64件是这个时机发生的（其中含2件险性事故），占总件数的27．9％。事故发生均是车站与机务
1 Preface locomotive out, eight, is one of the four key attendance flight attendants. The traffic accident occurred in this timing occupies a considerable proportion in the shunting accident. According to statistics, 64 of the 222 shunting accidents occurred in the operation system of Harbin Railway Bureau during 1990-1995 occurred at this time (including 2 dangerous accidents), accounting for 27.9% of the total number. Accidents are stations and maintenance