With no explanation, label each line with "O", "product-train", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
They
were
the
first
member
of
the
Electrostar
family
,
which
also
includes
Classes
375
,
376
,
377
,
378
,
379
and
387
,
and
are
the
most
numerous
type
of
EMU
built
in
the
post-privatisation
period
of
Britain
's
railways
.
They:O
were:O
the:O
first:O
member:O
of:O
the:O
Electrostar:product-train
family:O
,:O
which:O
also:O
includes:O
Classes:O
375:O
,:O
376:O
,:O
377:O
,:O
378:O
,:O
379:O
and:O
387:O
,:O
and:O
are:O
the:O
most:O
numerous:O
type:O
of:O
EMU:product-train
built:O
in:O
the:O
post-privatisation:O
period:O
of:O
Britain:O
's:O
railways:O
.:O