Explanation :
It is given that :
Position of the particle changes w.r.t time. Initial position tells us the position of body at t = 0 and final position of the body tells position of body at time t.
The Initial position of train is 34 Km and it is displaced 589 Km from its initial position.
So, the final position of train is 589 Km + 34 Km = 623 Km