View and edit cant data for each curve.
For a description of the formulas that are used to calculate the values in this dialog box, see About Cant Variables and Formulas.
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Collapses all items in the tree view.
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Expands all items in the tree view.
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Add A Cant Critical Station -
Specifies a station along the alignment. Select a row in the editor and click
, the tabular editor temporarily closes and the command line prompts you to pick a station along the alignment.
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Remove a Cant Critical Station or Region -
Deletes the selected region or station.
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Undo -
Recovers the most recently changed data in the Cant Tabular Editor.
This button affects:
- changed value in a cell
- calculation from the Cant Curve Manager or Calculate Cant wizard
- addition or removal of a critical station
- removal of a transition region
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Redo -
Recovers the data that was reverted using Undo in the Cant Tabular Editor.
This button affects:
- changed value in a cell
- calculation from the Cant Curve Manager or Calculate Cant wizard
- addition or removal of a critical station
- removal of a transition region
- Clear All Cant Data
- Removes all cant data, including data in cells, critical stations, and transition regions.
Columns
- Cant Curve
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This column displays the Transition In Regions and Transition Out Regions for the curves in the alignment.
Expand each region to view or edit the cant parameters.
To manually add a new critical station, right-click a region or a parameter
Add Station.
Critical Stations include:
- End Level Rail
- Begin Full Cant
- Begin Curve
- End Full Cant
- End Curve
- Begin Level Rail
- Start Station and End Station
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Displays the start station and end station of each transition region. When you edit these fields for a Transition In Region, Transition Out Region, or a critical station, the Length field is updated. If the critical station you edit is the same as the Start Station or End Station of a Transition In Region or Transition In Region, that station value is also updated.
- Length
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Displays the length for the Transition In Region and the Transition Out Region.
Note: This value is read only. - Overlap
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Displays the
warning symbol for areas on the alignment where there is overlap. Click the
, and a task dialog box is displayed showing the options to resolve overlap. The conditions are either a reverse curve situation or a compound curve situation. To automatically resolve overlap you can select the option on the
Calculate Cant Wizard - Attainment Method Page. However, there can be situations where overlap is created by manually editing cant data.
- Applied Cant
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Specifies the applied cant value (in mm or in.) that was specified on the Calculate Cant Wizard - Attainment Method Page.
- Equilibrium Cant
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Specifies the result (in mm or in.) of the Equilibrium Cant calculation for a given speed and radius of curvature
Note: This value is read only. - Cant Deficiency
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Specifies the difference (in mm or in.) between Equilibrium Cant and Applied Cant.
- Cant Ratio
- Specifies the Cant Ratio as a percentage, which is the ratio between the Cant Deficiency to the Applied Cant value at the critical station.
Note: This value is read only.
- Cant Gradient
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Specifies the cant gradient value (rise:run), which is the ratio between the difference in cant from the current critical station to the next critical station, and the length of the transition.
- Vertical Speed
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The speed (in m/s or ft/s) that is applied upward in a curve. This specifies the rate of change of applied cant at the maximum permissible speed of a vehicle passing over the transition curve.
Note: This value is read only. - Lateral Acceleration
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The rate (in m/s^2 or ft/s^2) at which centrifugal force is applied outward from a curve.
Note: This value is read only. - Cant Jerk
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Specifies Cant Jerk (m/s^3), which is the rate of change of the lateral acceleration of a vehicle over time.
Note: This value is read only. - Curve Radius
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Specifies the curve radius value at the critical station.
Note: This value is read only. - Equilibrium Cant Gradient
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Specifies the ratio between the difference in equilibrium cant from the current critical station to the next critical station, and the length of the transition.
Note: This value is read only. - Equilibrium Cant Vertical Speed
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Specifies the rate of change of equilibrium cant (increased or reduced in ft/s or m/s) at the maximum permissible speed of a vehicle passing over the transition curve.
Note: This value is read only. - Cant Deficiency Gradient
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Specifies the ratio between the difference in cant deficiency from the current critical station to the next critical station, and the length of the transition.
Note: This value is read only. - Design Speed
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Specifies the maximum permissible speed of the vehicle passing over the transition curve.
Note: This value is read only. - Cant Deficiency Vertical Speed
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Specifies the rate of change of cant deficiency (increased or reduced in ft/s or m/s) at the maximum permissible speed of a vehicle passing over the transition curve.
Note: This value is read only.