S1, E2: The British actor and icon reaches Mongolia, the mid-point of her 6,400-mile journey along the storied rail route. Here, she spends time with nomads and visits a giant Genghis Khan statue. In the capital, Ulan Bator, she tracks down the famous throat-singers. Next, bound for Russia and the Siberian leg of her trek, she experiences a spot of bother at the border.