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 ":".
PC
conveyed
the
train
to
Amtrak
in
1971
,
who
operated
it
until
1995
.
PC:organization-company
conveyed:O
the:O
train:O
to:O
Amtrak:organization-company
in:O
1971:O
,:O
who:O
operated:O
it:O
until:O
1995:O
.:O