  We show that one can obtain asymptotic evolving boost-invariant geometries in
a simple manner from the corresponding static solutions. We exhibit the
procedure in the case of a supergravity dual of R-charged hydrodynamics by
turning on a supergravity gauge field and analyze the relevant thermodynamics.
Finally we consider turning on the dilaton and show that electric and magnetic
modes in the plasma equilibrate before reaching asymptotic proper times.
