  We study superconducting transport in homogeneous wires in the cases of both
equilibrium and nonequilibrium quasiparticle populations, using the
quasiclassical Green's function technique. We consider superconductors with
arbitrary current densities and impurity concentrations ranging from the clean
to the dirty limit. Local current conservation is guaranteed by ensuring that
the order parameter satisfies the self-consistency equation at each point. For
equilibrium transport, we compute the current, the order parameter amplitude,
and the quasiparticle density of states as a function of the superfluid
velocity, temperature, and disorder strength. Nonequilibrium is characterized
by incoming quasiparticles with different chemical potentials at each end of
the superconductor. We calculate the profiles of the electrostratic potential,
order parameter, and effective quasiparticle gap. We find that a transport
regime of current-induced gapless superconductivity can be achieved in clean
superconductors, the stability of this state being enhanced by nonequilibrium.
