  A realistic model describing a black string-like object in an expanding
Universe is analyzed in the context of the McVittie's solution of the Einstein
field equations. The bulk metric near the brane is provided analogously to
previous solutions for black strings. In particular, we show that at least when
the Hubble parameter on the brane is positive, a black string-like object seems
to play a fundamental role in the braneworld scenario, generalizing the
standard black strings in the context of a dynamical brane.
