restraining lilypond

[Hugh Myers]

Given:

\version "2.13.7"
\header {
  tagline = ##f
}
\layout {
  \context {
    \Staff
    \remove "Time_signature_engraver"
  }
}
\paper{
  indent = 0\mm
  paper-width = 3\in
  line-width = 1.5\in
  paper-height = 5\in
  print-page-number = ##f
}
\relative c'{
  \set Score.barNumberVisibility = ##f
  e,4 s2.
  \pageBreak
  f4 s2.
}

I had expected each page to begin in the same location. They don't.
Why? What may be done to restrain lilypond?

--hsm