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 ":".
Four
locomotives
of
the
Milwaukee
Road
class
A
were
constructed
for
this
service
in
1935
.
Four:O
locomotives:O
of:O
the:O
Milwaukee:organization-company
Road:organization-company
class:O
A:O
were:O
constructed:O
for:O
this:O
service:O
in:O
1935:O
.:O