locomotive

locomotive
/ˈləukəməutɪv; ˌlokə`motɪv/ adj
of, having or causing locomotion 移动的; 有移动力的; 产生运动的
    locomotive power 移动力. n = engine 2
    electric, diesel, steam, etc locomotives 电气、 柴油、 蒸汽等机车.

牛津英汉双解词典