Symbols
Symbols and their meaning for railway construction
Symbol | Meaning of the symbol | Unit |
---|---|---|
a | Vertex distance with vertical curve | m |
AA | Start of vertical curve | |
AE | End of vertical curve | m/s² |
ar | Radial acceleration | m/s² |
ap | Transverse acceleration | |
BA | Start of curve | |
BE | End of curve | |
BM | Centre of curve | |
BW | Change of radius | |
e | Distance between centres of lines | m |
f | Displacement of the track curve compared with the tangent with a transition curve | mm |
hf | Versine | mm |
Δ h | Height difference | m |
l | Longitudinal gradient | ‰ |
k | Curvature of the track curve | |
l a | Length of the connecting curve with peaks and troughs | m |
l b | Length of the circular curve (length of curve) | m |
l g | Length of an intermediate piece of track | m |
l n | Usable track length (also known as the UL) | m |
l R | Length of the superelevation ramp | m |
I RB | Length of the superelevation ramp according to Bloss | m |
l RS | Length of the S-shaped superelevation ramp | m |
l t | Tangent length | m |
l ta | Tangent length of the vertical curve | m |
l U | Length of transition curve, straight curvature line | m |
l UB | Length of transition curve according to Bloss | m |
l US | Length of transition curve, S shaped curve | m |
l w | Length of turnout | m |
ldSch | Last long sleeper | m |
max | Attachment for highest value | |
min | Attachment for lowest value | |
1 : m | Inclination of the superelevation ramp | |
1 : n | Inclination of the turnout tangent | |
N | Inclination | m |
HüNN | Height above normal zero | |
NW | Change in gradient | m |
oA | Without details of the vertical gradient radius | |
r | Curve radius | m |
r o | Radius of the branch-track of the turnout shape | m |
r a | Vertical gradient radius of the change in gradient | m |
r s | Radius of the main line of a curved turnout | m |
r z | Radius of the branch-track of a curved turnout | m |
reg | Attachment for basic value | |
RA | Start of ramp | |
reg | End of ramp | |
RM | Centre of ramp | |
s | Distance of the centres of the rail heads or line | mm; m |
S | Line gradient as specified by DIN | ‰ |
TS | Tangent intersection point | |
u | Superelevation of the outer rail | mm |
u o | Equalising superelevation | mm |
u f | Cant deficiency | mm |
u u | Superelevation excess | mm |
UA | Start of transition curve | |
UE | End of transition curve | |
UM | Centre of transition curve | |
v e | Design speed | km/h |
WA | Start of turnout | |
WE | End of turnout | |
WTS | Point of intersection of the turnout tangents | |
zul | Attachment for permissible value |