With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Diesel–mechanical
propulsion
is
limited
by
the
difficulty
of
building
a
reasonably
sized
transmission
capable
of
coping
with
the
power
and
torque
required
to
move
a
heavy
train
.
Diesel–mechanical:O
propulsion:O
is:O
limited:O
by:O
the:O
difficulty:O
of:O
building:O
a:O
reasonably:O
sized:O
transmission:O
capable:O
of:O
coping:O
with:O
the:O
power:O
and:O
torque:O
required:O
to:O
move:O
a:O
heavy:O
train:O
.:O