With no explanation, label each line with "location-GPE", "O", "organization-company", "product-train", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Vacuum
brakes
have
been
entirely
superseded
on
the
National
Rail
system
in
the
UK
(
with
the
British
Rail
Class
121
``
bubble
cars
``
being
the
last
mainline
trains
to
have
vacuum
brakes-they
finished
service
in
2017
)
,
although
they
are
still
in
use
on
most
standard
gauge
heritage
railways
.
Vacuum:O
brakes:O
have:O
been:O
entirely:O
superseded:O
on:O
the:O
National:O
Rail:O
system:O
in:O
the:O
UK:location-GPE
(:O
with:O
the:O
British:organization-company
Rail:organization-company
Class:O
121:O
``:O
bubble:product-train
cars:product-train
``:O
being:O
the:O
last:O
mainline:O
trains:O
to:O
have:O
vacuum:O
brakes-they:O
finished:O
service:O
in:O
2017:O
):O
,:O
although:O
they:O
are:O
still:O
in:O
use:O
on:O
most:O
standard:O
gauge:O
heritage:O
railways:O
.:O