一九八零年十月三棵树机务段更换机型，由内燃机车替代蒸汽机车。
B-Time I-Time I-Time I-Time I-Time I-Time I-Time B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization O O O O O O B-Thing I-Thing I-Thing I-Thing O O B-Thing I-Thing I-Thing I-Thing O