  It is proposed that soft particle production in hadronic collisions is
dominated by multiple gluon exchanges between partons from the colliding
hadrons, followed by radiation of hadronic clusters from the coloured partons
distributed uniformly in rapidity. This explains naturally two dominant
features of the data: (a) The linear increase of rapidity spectra in the
regions of limiting fragmentation and, (b) the proportionality between the
increasing width of the limiting fragmentation region and the height of the
central plateau.
