The track stitch is actually fairly simple to make. The result - a look that suggests someone ran over it... it makes tracks in the work, hence the name of the pattern.
To create this pattern crochet an uneven number of rows with single crochet. Then work a row of treble crochet stitches. Repeat this pattern throughout your work and you'll see the tracks. Finish with a row of single crochet stitches though so your work holds its shape.
Why does it matter that the number of rows worked in single crochet be uneven? This ensures that the right side of the treble crochet stitches is seen on the right side of your work. Here are a couple of pictures to show you what I mean.
The back of the treble crochet stitches looks like chains. The front is flatter and the two horizontal bars can be seen.