  The symmetries associated with discrete-time quantum walks (DTQWs) and the
flexibilities in controlling their dynamical parameters allow to create a large
number of topological phases. An interface in position space, which separates
two regions with different topological numbers, can, for example, be
effectively modelled using different coin parameters for the walk on either
side of the interface. Depending on the neighbouring numbers, this can lead to
localized states in one-dimensional configurations and here we carry out a
detailed study into the strength of such localized states. We show that it can
be related to the amount of entanglement created by the walks, with minima
appearing for strong localizations. This feature also persists in the presence
of small amounts of $\sigma_x$ (bit flip) noise.
