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Left/right rail stake-
out
43.6.12
Sign convention for
offsets
43.6.13
Terms and expres-
sions
698
Description
The left or right rail of a track can be staked out:
directly,
•
•
horizontal and/or vertical offsets can be used to stake any point relative to
either rail.
Diagram - Staking out a point relative to the right rail
a
b
Rail_007
a
Track centreline
b
Left rail
c
Right rail
d
Point to stake
e
Horizontal offset from right rail
f
Vertical offset from right rail
☞
The position from which the horizontal and rail offsets will be applied
depends on how the left and right rails were defined in the imported
design data. Using standard practice, the horizontal offset would be
defined from the active face of the rail, and the height offset would
be defined from the highest part of the rail, as shown in the diagram.
Rail - Working with Offsets
The sign convention for offsets is:
d
a
-
e
-
Rail_008
a
Centreline
b
Positive horizontal offset
c
Positive vertical offset
d
Negative horizontal offset
e
Negative vertical offset
Tunnel - Basic Terms
Term/Expression
Centreline
d
f
e
c
+
c
+
b
Description
Geometric alignment in two or three dimen-
sions to which all design elements of the
project are referenced.
Roads - General
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