We study a far-from-equilibrium system of interacting particles, hopping
between sites of a 1d lattice with a rate which increases with the number of
particles at interacting sites. We find that clusters of particles, which
initially spontaneously form in the system, begin to move at increasing speed
as they gain particles. Ultimately, they produce a moving condensate which
comprises a finite fraction of the mass in the system. We show that, in
contrast with previously studied models of condensation, the relaxation time to
steady state decreases as an inverse power of ln L with system size L and that
condensation is instantenous for L-->infinity.Comment: 5 pages, 5 figures, minor changes, references adde
