  We investigate boosted displaced signatures in the Type-I seesaw mechanism
associated with the $B-L$ gauge symmetry. Such events arise from decays of
right-handed neutrinos depending on their Yukawa couplings and masses.
Considering two scenarios: (a) three degenerate right-handed neutrinos whose
Yukawa couplings are reconstructed from the observed neutrino masses and
mixing; (b) only one right-handed neutrino which decouples from the observed
neutrino mass generation and thus its coupling can be arbitrarily small, a
detailed PYTHIA based simulation is performed to determine the parameter
regions of the $B-L$ gauge boson mass, the neutrino Yukawa couplings, and the
right-handed neutrino mass sensitive to CMS, ATLAS, proposed FCC-hh detector
and MATHUSLA at the centre of mass energies of 14, 27 and 100 TeV via displaced
signatures. We also show in detail how the boost effect enhances the displaced
decay lengths, especially for the longitudinal ones, and hinders the probe of
Majorana nature of neutrinos.
