With no explanation, label each line with "O", "location-road/railway/highway/transit", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
primary
customer
was
Amtrak
,
which
bought
54
for
use
on
the
Northeast
Corridor
and
Keystone
Corridor
.
The:O
primary:O
customer:O
was:O
Amtrak:organization-company
,:O
which:O
bought:O
54:O
for:O
use:O
on:O
the:O
Northeast:location-road/railway/highway/transit
Corridor:location-road/railway/highway/transit
and:O
Keystone:location-road/railway/highway/transit
Corridor:location-road/railway/highway/transit
.:O