Last Updated：2022/12/22
Sentence
Everyone
knows
that
a
main
line
running
through
a
coalfield
is
prone
to
speed
restrictions
because
of
land
subsidence.
…
The
rate
of
subsidence
may
vary
from
less
than
an
inch
a
month
in
the
case
of
a
deep
seam
of
coal,
to
as
rapid
a
decline
as
16in
a
month
above
a
shallow
seam.
The
effect
of
subsidence
on
permanent
way
and
civil
engineering
structures
needs
no
emphasis.
Quizzes for review
Everyone knows that a main line running through a coalfield is prone to speed restrictions because of land subsidence. … The rate of subsidence may vary from less than an inch a month in the case of a deep seam of coal, to as rapid a decline as 16in a month above a shallow seam. The effect of subsidence on permanent way and civil engineering structures needs no emphasis.
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