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Worker killed when muck car broke free from
battery-powered locomotive and ran out of
control at the tunnel construction site.
|[Circumstances of the Incident]
This accident occurred during tunnel
work that was being carried out by
The mud-shield method being used at
the tunnel construction site involved
excavations at the cutting face by a
shield-tunneling machine, segment erection
work, muck transportation by a battery locomotive
and muck cars, and mucking work from the
On the day of the accident, workers
operations at 20:00 and took
break at 20 minutes after midnight.
operator came to the resting room after
the make-up of the train
into the locomotive
and a muck car.
At around 1:00, two segment workers,
a surveyor and
the shield machine operator entered
the tunnel to restart their work at the
The locomotive operator got into the
train at the shaft entrance and backed
the muck car towards the cutting face. When
the train came to the pithead, the muck car suddenly
broke free from the locomotive and started
running down the 4-percent grade towards
the cutting face.
The car brushed against a segment worker some
59 meters from the pithead, ran over
a surveyor and
crashed into the shield machine operator
at a point close to the cutting face,
derailing and coming to a stop around
meters from the pithead.
The following can be considered as the causes
of this accident.
1 The locomotive operator failed to
a connecting pin into the coupling
changing the make up of his train
the locomotive and the muck car.
was the reason the car broke free
of the locomotive
coupling at a point where the 4-percent
started and ran out of control .
2. As a rule, cars are prohibited from running
in the tunnel when workers are working in
the tunnell, and workers are prohibited from entering
the tunnel when cars are running. However,
the locomotive operator moved his train into the
tunnel despite the fact that he knew that
workers were passing through the tunnel.
Moreover, the shield machine operator and
the locomotive operator failed to observe
the rule that they must communicate
with each other by interphone before
entering the tunnel or when they can enter
|[Type of business] Tunnel construction
[Type of accident] Crush
[Number of victims] One fatality and one injury requiring an
absence from work