Zbornik radova Koridor 10 - Kirilo Savić

3rd International Scientific and Professional Conference
CORRIDOR 10 - a sustainable way of integrations
Fig. 6. Cross level in accordance with EN 13848-1
Alignment is a deviation y p’ in y-direction of consecutive positions of point P on any rail expressed as
an excursion from the mean horizontal position (reference line) and calculated from successive
measurements is longitudinal level (Figure 7) [1].
Alignment of track is defined as follows:
y ' x y ' x
p1
p
y x
2
'
, (
p
2
' 0, y
p ' 1 p 2
0 ) (3)
where:
y , y – alignments of left and right rail.
' '
p 1 p 2
1 running surface
2 reference line
Fig. 7. Alignment in accordance with EN 13848-1
Twist is the algebraic difference between two cross levels taken at a defined distance apart (usually at
the distance equivalent to the wheel-base) (Figure 8) [1]. It is expressed as a gradient between two
points of measurement:
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