វគ្គជំនាញកុំព្យូទ័រ
ចំណេះដឹងទូទៅ
ម្ហូបអាហារ
កំប្លែង
ទស្សន៍ទាយ
small
medium
large
Block signal
noun
1.
សញ្ញាប្លុក
ENGLISH MEANING
1.
One of the
danger
signals
or
safety
signals
which
guide
the
movement
of
trains
in a
block
system
. The
signal
is
often
so
coupled
with a
switch
that
act
of
opening
or
closing
the
switch
operates
the
signal
also
.