With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Service
with
electric
locomotives
between
New
Haven
and
Boston
began
on
January
31
,
2000
.
Service:O
with:O
electric:O
locomotives:O
between:O
New:location-GPE
Haven:location-GPE
and:O
Boston:location-GPE
began:O
on:O
January:O
31:O
,:O
2000:O
.:O