Last Updated：2026/01/01
Sentence
The
line
is
signalled
with
upper
quadrant
semaphores
and
Sykes
lock
and
block
three-wire
two-position
block
instruments.
…
The
Inspecting
Officer
concludes
that
both
signalmen
must
share
responsibility
for
the
accident
by
the
irregular
release
of
the
block
instrument,
but
remarks
that
the
two-position
Sykes
instruments,
although
ample
for
maintaining
safety
under
normal
working,
do
not
show
clearly
the
state
of
the
block
section
ahead.
Quizzes for review
The line is signalled with upper quadrant semaphores and Sykes lock and block three-wire two-position block instruments. … The Inspecting Officer concludes that both signalmen must share responsibility for the accident by the irregular release of the block instrument, but remarks that the two-position Sykes instruments, although ample for maintaining safety under normal working, do not show clearly the state of the block section ahead.
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