void returnVans(TTRAIN * train) {
    if (train == NULL)return;
    TVAN* now = train -> m_Start;
    train->m_Count = 0;
    train->m_Start = NULL;

    while(now!=NULL){
        free(now -> m_To);		
	now = now -> m_Next;	       	
    }       

    return;
}