Question about LEGO Passenger express train

So in one set I only have half a train. Typical Lego, like the half pyramid, buy two get one! And you still rate the product so well. As with the pyramid, Lego itself advertises that you can buy two. Older Lego passenger trains always had a locomotive at both ends. It looks much nicer and you don't have the feeling that you're only holding half a train in your hand.