\version "2.11.41"

#(set-bar-number-visibility 1)

\relative c'' { \dynamicUp
  % Show bar numbers
  \override Score.BarNumber  #'break-visibility = #end-of-line-invisible
  % set text crescendi and hide the line
  \setTextCresc \override DynamicTextSpanner #'dash-period = #-1.0
  c1\< |
  \key a \major 
  c1\p
}