a
Chainage centreline
b
Left track centreline
c
Left track left rail
d
Left track right rail
e
Left track left rail superelevation
f
Left track right rail superelevation
g
Right track centreline
h
Right track left rail
i
Right track right rail
j
Right track left rail superelevation
k
Right track right rail superelevation
For multiple tracks, the chainage centreline is used only to calculate the chain-
age. The superelevation of each track is calculated with respect to the corre-
sponding (left / right) vertical alignment. The chainage centreline can consist of
a plan and a vertical component. Although the vertical component of the
chainage centreline is not used for any calculation.
43.6.11
Rail - Check Elements and Stakeout Elements
Points can be staked with respect to three basic elements of the track:
•
Track centreline
•
Left rail
•
Right rail
Description
The line to stake out can be a track centreline or, in the case of multiple tracks,
the left or right track centreline. In both cases, a horizontal offset with respect
to the centreline can be applied. Additionally, if a vertical alignment is available
for a track centreline, a vertical offset can be applied.
Diagram - Single track elements
a
Rail_006
a
b
c
d
e
f
a
Track centreline
b
Left rail
c
Right rail
d
Point to stake
e
Horizontal offset from track centreline
f
Vertical offset from track centreline
Calculations
Description
Centreline stakeout
Roads - General
697
