With no explanation, label each line with "location-other", "product-car", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
In
1997
,
Amtrak
extended
the
scheme
to
locomotives
,
initially
GE
P42DC
diesel
locomotives
on
Northeast
Corridor
services
.
In:O
1997:O
,:O
Amtrak:organization-company
extended:O
the:O
scheme:O
to:O
locomotives:O
,:O
initially:O
GE:product-car
P42DC:product-car
diesel:O
locomotives:O
on:O
Northeast:location-other
Corridor:location-other
services:O
.:O