Last Updated：2025/12/30
Sentence
The
track
blanketing
required
excavation
of
up
and
down
main
lines
to
a
depth
of
4½ft
below
rail
level
for
1⅜
miles,
to
allow
the
defective
track
bed
to
be
removed
and
replaced
by
a
new
formation.
…
a
layer
of
polythene
was
employed
by
the
E.R.
at
the
base
of
the
new
formation;
…
On
top
of
the
polythene
is
laid
the
sand,
as
a
blanketing
and
drainage
medium,
and
above
that
the
ballast.
Quizzes for review
The track blanketing required excavation of up and down main lines to a depth of 4½ft below rail level for 1⅜ miles, to allow the defective track bed to be removed and replaced by a new formation. … a layer of polythene was employed by the E.R. at the base of the new formation; … On top of the polythene is laid the sand, as a blanketing and drainage medium, and above that the ballast.
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