With no explanation, label each line with "location-GPE", "O", "location-road/railway/highway/transit", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
They
were
built
specifically
for
the
Lea
Valley
Line
based
at
Stratford
,
but
were
displaced
to
the
ECML
suburban
lines
out
of
Kings
Cross
when
the
Lea
Valley
Line
received
25
kV
overhead
electrification
in
May
1969
.
They:O
were:O
built:O
specifically:O
for:O
the:O
Lea:location-road/railway/highway/transit
Valley:location-road/railway/highway/transit
Line:location-road/railway/highway/transit
based:O
at:O
Stratford:location-GPE
,:O
but:O
were:O
displaced:O
to:O
the:O
ECML:location-road/railway/highway/transit
suburban:location-road/railway/highway/transit
lines:location-road/railway/highway/transit
out:O
of:O
Kings:location-road/railway/highway/transit
Cross:location-road/railway/highway/transit
when:O
the:O
Lea:location-road/railway/highway/transit
Valley:location-road/railway/highway/transit
Line:location-road/railway/highway/transit
received:O
25:O
kV:O
overhead:O
electrification:O
in:O
May:O
1969:O
.:O