Using the Calculate Cant wizard, you can specify railway design standards, including formulas for equilibrium cant and maximum cant deficiency, and tables for applied cant, transition length and attainment method.
Railway design standards are stored in the drawing settings and the railway design criteria file. The appropriate standards are specified in the Calculate Cant wizard.
Default formulas for equilibrium cant and maximum allowable cant deficiency are stored in the drawing settings. The default formulas may be modified as needed before cant is calculated along the alignment.
The differential level (in mm or in.) at which the vertical wheel force is equal on both rails. You can modify the formula to incorporate mathematical operators and properties such as design speed, radius, and track width.
The default equilibrium cant formulas are:
Specifies the maximum allowable cant deficiency value to use in cant calculations. You can either enter a static value, or build an expression that incorporates mathematical operators and properties such as design speed, radius, and track width.
The default maximum allowable cant deficiency values are:
The following railway design standards are contained in the design criteria file . You can customize the design criteria file to reflect your local standards using the Design Criteria Editor dialog box.
The XML-based design criteria file stores the standard tables and formulas that you can use to calculate cant rates and critical chainages on an alignment.
The applied cant table defines minimum radii for rail type and design speed.
The transition length table specifies values you can use in the Attainment Method formulas. You can use the table to calculate the distances between the cant critical chainages as a function of curve radius and design speed.
Specifies how cant is applied, and the method that is used to calculate cant critical chainages in different situations. Each defined method specifies the variables used to calculate the distances between the critical chainages.