  We investigate generalized thermalization in an isolated free Fermionic chain
evolving from an out of equilibrium initial state through a sudden quench. We
consider the quench where a Fermionic chain is broken into two disjoint chains.
We focus on the evolution of the local observables namely, occupation number,
nearest neighbor hopping, information sharing and out-of-time-order
correlations after the quench and study the relaxation of the observable,
leading to generalized Gibbs ensemble for the system in the thermodynamic limit
though it has been argued that non-interacting or free Fermionic models in
general do not relax to GGE. We obtain the light cone formed by the evolution
of the observables along the Fermionic lattice chain due to the sudden quench
which abides by the Lieb-Robinson bound in quantum systems. We also
analytically study a simpler model which captures the essential features of the
system. Our analysis strongly suggests that the internal interactions within
the system do not remain of much importance once the quench is sufficiently
strong.
