[This is a draft page]
I’ll collect here all my posts on track geometry and try to arrange them in a logical order … but it will take some time.
- General elements
- Track definitions and simplifications
- Track centreline. Differences between the centerline radius and the rail radii. Versine convention.
- Why a right hand curve is positive?
- Track Quality Index. Evaluation of the track quality
- Track defect
- Track Quality Index
- Inherent Track Geometry Standard Deviation
- Rolling Standard Deviation. Inherent Rolling Standard Deviation.
- Tolerances. Errors. 1+1=1!
- The limits of track alignment design parameters. Safety and comfort parameters. EN 13803-1 Definitions.
- Track design drawings
- Horizontal arrangement
- Vertical profile
- Cross sections
- Track definitions and simplifications
- Track alignment theory
- Vehicle running through a curve
- Cant parameters
- Cant Deficiency. Cant Excess
- Rates of change of cant and cant deficiency
- Cant and cant deficiency diagrams.
- Horizontal and Vertical Jerk
- Ways of applying the cant
- Transition curves
- Principles of track rectification and realignment
- Versine definition
- Types of versines
- Curvature and versine diagrams
- Horizontal alignment
- Horizontal curves and cant design
- How is the cant measures?
- Cant and cant deficiency. Where 11.82 is coming from?
- Cant transition
- Designing a sudden change in curvature. Virtual transition
- Transition curves
- Clothoid. The Clothoid geometry. The Clothoid shift
- Cubic Parabolas
- Non-linear transitions parameters
- Bloss transition
- Cosinusoidal transition – the Japanese transition. The Cosinusoidal transition parameters used on California High-Speed Rail
- Bi-quadratic transition
- Sinusoidal transition
- Hasslinger transition – the Viennese curve
- Vertical alignment
- Vertical curve
- The limits of vertical acceleration
- Vertical parabolic curve
- Vertical circular curve
- Transitioned vertical curves
- Vertical alignment design principles
- Particular design topics
- Green field design principles
- Null earthworks axis
- Geometrisation. Primary alignment. Final alignment.
- Refining the design alignment
- Reverse curve design. Cant over the reverse curve
- Linear transition
- Non-linear transition
- Virtual transition design examples. TRK 2049 justification.
- Chainage creep
- Platform clearances
- Relative position of adjacent tracks
- Maglev guideway alignment design
- Green field design principles
- Rectification and realignment methods
- The versine formula
- Versine (Hallade) surveying. Checking the versine survey precision.
- Types of versines
- Rectification. Realignment
- Hallade realignment method
- Direction angle method
- Other realignment methods. Cassan