  This paper focuses on two aspects of the Physics of Radio Galaxies in which
it has been proposed that relativistic beaming of radiation is necessary to
account for the observations. Physical arguments are presented which show that
it is quite plausible that the jets in FRI radio galaxies are relativistic on
the parsec scale and decelerate to subrelativistic flow on the kiloparsec
scale. On the other hand it is shown that beaming of the optical continuum from
the core of Centaurus~A is not necessary to account for the excitation of the
emission line filaments in the ISM of this galaxy. Models involving
autoionizing shocks produced by the interaction between a low Mach number jet
and dense clouds along its path are capable of explaining the morphology of the
filaments and the simultaneous high excitation and low excitation lines in
their spectra.
