With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
These
trains
replaced
the
original
PTC
trailer-style
trains
which
were
known
to
have
an
extremely
rough
ride
.
These:O
trains:O
replaced:O
the:O
original:O
PTC:organization-company
trailer-style:O
trains:O
which:O
were:O
known:O
to:O
have:O
an:O
extremely:O
rough:O
ride:O
.:O