"\override BarLine" for a PianoStaff

I frequently use lilypond for short theory
examples for teaching, and for such examples
I often use the code:

   \override BarLine.transparent = ##t

to make bar lines disappear.  This has always worked
for me for a single staff, but when I just tried
to do this with a grand staff in the excerpt
below, the bar lines only disappeared "on the staves"
but still appeared "between the staves".
Running the excerpt below will illustrate this.

How do I make the entire bar lines transparent
for a grand staff?

Thank you for your help.


\version "2.24.1"
\language "english"

\paper{ indent = 0\cm }

\score {

  \new PianoStaff
  <<
  \new Staff \with { \remove "Time_signature_engraver" }
  {
    \time 4/4
    \clef "treble"
    s1   s1     s1   s1   e'1    b'1   fs''   cs'''   gs'''
  }

  \new Staff \with { \remove "Time_signature_engraver" }
  {
    \time 4/4
    \clef "bass"
    c,1   g,1   d1   a1    e'1   s1    s1    s1      s1
  }
  >>

  \layout {

    \context {
       \Score
       \override BarLine.transparent = ##t
    }
  }

} % score

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