\version "2.13.4"
\pointAndClickOff
\score {
  \new StaffGroup <<
    \new Staff {
      \set Staff.shortInstrumentName = "A 1"
      c''1 \break c''1
    }
    \new Staff {
      \set Staff.shortInstrumentName = "B 2"
      R1*2
    }
    \new Staff {
      \set Staff.shortInstrumentName = "C 3"
      R1*2
    }
  >>
 \layout {
  \context { \RemoveEmptyStaffContext }
 }
}