If you have then you would notice that as the rails get further away from you they appear to come togather. This is a Phenomenon known as linear perspective.
People use linear perspective as a cue in estimating distance.
We know that the tracks are not really coming togather but to our sight they apper that way. As you stand inbetween the tracks you would be able to see that they are about 6 to 7 feet apart. As the tracks get further away from you they start to merge togather until they appear to come togather as one. This reminds me of our spiritual life. Before we have Jesus in our life we are seperated from God.