In Fahrenheit 451, what did the railroad tracks mean to Montag?

In the most simplistic of ways, the railroad tracks mean
that Montag is to change into his new form. The tracks lead to the group of wanderers
known as "the book covers."  As he follows them, Montag knows that he has shed his
identity from the city as a fireman, once and for all.  He knows that such a
consciousness is dead and that there can be no going back.  It is why he thinks of
Clarisse as Montag walks along the tracks.  Once the tracks lead to Granger and the new
group, Montag is able to embrace his new identity and his new conception of self.  The
change that was initiated by Clarisse's interaction and the question of "Are you happy?"
has now led to this new form of being a "book cover."  The railroad tracks represents
this new conception of self and Montag recognizes this.  He understands that his new
identity lies as he follows these tracks away from the city and towards a new sense of
self.  In the end, this is what the tracks mean and what they represent to Montag.  In a
condition where Montag needed guidance and understanding in his reconception of self,
the railroad tracks provided a physical path to follow in order to achieve a sense of
internal change.