What is the theme in Station by Eamon Grennan?

A major theme of this poem is of life journey and transition. At the literal level of the poem, the journey the boy takes is from his father's home to his mother's home. But this journey also symbolizes the boy's journey in life, from childhood to adolescence and beyond, which is clear from the father's reference to the "faint fuzz" growing on the boy's face. The father sees this first sign of adolescence as a "beginning," the visible evidence that the boy is about to leave childhood behind.