If for some reason the engine and boxcars become disconnected, the engine will countiue to move down the tracks.

해석 이 안됩니다.
만약 몇가지 이유에 대한 ... the engine을 어떻게 해석해야할지..However, the boxcars will not move anywhere by themselves because they are dependent on the engine to move them from place to place.여기서 to 는 ~ 하기 위해서 라는 뜻인가요???