Train Tracks is part of the Jolly Phonics Little Word Books series. It is the seventh of fourteen decodable readers providing a gradual and structured start for children who are just learning to read. 

The seventh and eighth books in the series, Train Tracks and Mmm, Snacks, use only decodable regular words made up from the first four groups of letter sounds: 

s, a, t, i, p, n

c k, e, h, r, m, d

g, o, u, l, f, b

ai, j, oa, ie, ee, or

Tips and guidance for teachers and parents are provided at the end of each book. Light type is used as a guide for those few letters that should not be sounded out, such as the /b/ in ‘lamb’.