With no explanation, label each line with "O", "organization-company", "product-train", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
These
services
are
operated
by
West
Midlands
Trains
under
the
'
West
Midlands
Railway
'
brand
using
British
Rail
Class
170
Diesel
Multiple
Units
,
which
will
be
replaced
by
British
Rail
Class
196
DMUs
in
2021
.
These:O
services:O
are:O
operated:O
by:O
West:product-train
Midlands:product-train
Trains:product-train
under:O
the:O
':O
West:organization-company
Midlands:organization-company
Railway:organization-company
':O
brand:O
using:O
British:product-train
Rail:product-train
Class:product-train
170:product-train
Diesel:product-train
Multiple:product-train
Units:product-train
,:O
which:O
will:O
be:O
replaced:O
by:O
British:product-train
Rail:product-train
Class:product-train
196:product-train
DMUs:product-train
in:O
2021:O
.:O