  The time evolution of the averaged energy momentum tensor as well as its
variation with energy density are calculated in a far-from-equilibrium state of
$\mathcal{N}=4$ SYM theory undergoing a Bjorken expansion. The calculation is
carried out holographically where we consider a collection of trajectories of
the energy density in the space of solutions by small changes to the initial
conditions of the bulk spacetime. We argue that the proper interpretation of
the variation of the diagonal energy momentum tensor components with respect to
the energy density is that of a far-from-equilibrium speed of sound. We
demonstrate remarkable agreement with a corresponding hydrodynamic prediction.
We find by Borel resummation that the holographic system has one attractor for
this speed of sound longitudinal, and another transverse to the direction of
Bjorken expansion. Attractor times for various initial flow conditions show
that reaching an attractor does not imply or require local thermal equilibrium.
In the cases studied, reaching an attractor implies hydrodynamization
(quantities evolve approximately according to hydrodynamics), justifying the
name \emph{hydrodynamic attractor }
