  I present the various capabilities of upgraded and next generation radio
telescopes, in particular their ability to detect and image distant star
forming galaxies. I demonstrate that e-MERLIN, EVLA and LOFAR can detect
systems similar to Arp 220 out to cosmological distances. The SKA can detect
such systems out to any reasonable redshift that they might be expected to
exist. Employing very long integration times on the multiple-beam SKA will
require the array to be extended beyond the current specification - simply to
avoid confusion noise limitations at 1.4 GHz. Other arguements for extending
the SKA baseline length are also presented. As well as going ``deeper'' all
these instruments (especially LOFAR and the SKA) will also go ``wider'' -
detecting many tens of thousands of galaxies in a single day's observing. I
briefly comment on the prospects of detecting radio emission at much earlier
epochs, just before the epoch of re-ionisation.
