  We are carrying out a program of optical spectroscopy of the complete
subsample of the 3CR catalog of radio sources at redshift z < 0.3. The sample
consists of 113 3CR sources, comprising FR I, FR II radio galaxies and Quasars.
Complete datasets in other bands are already or will be soon available for the
whole sample but the optical spectra are sparse and inhomogeneous in quality.
The observations are carried out at the 3.58m Telescopio Nazionale Galileo
(TNG, La Palma). More than 100 sources have been already observed. We present
here the preliminary results on the analysis of the high and low resolution
spectra. We found that sources can be spectroscopically characterized as: High
Excitation Galaxies (HEG), Low Excitation Galaxies (LEG) and "Relic" AGNs. This
classification is supported by the optical - radio correlations in which
objects spectroscopically different follow different correlations. We conclude
that AGNs with the same radio power can be fueled with different accretion
properties. "Relic" radio-galaxies are characterized by extreme low excitation
spectra that we interpret as nuclei whose activity has recently turned-off. The
full spectral catalog will be made available to the scientific community.
