Cant Standards

Design File Settings > Rail Settings

Cant Rounding Constant: specifies the value used to round the computed applied cant to an even interval. This value is expressed in millimeters or inches.

Centerline Rail to Centerline Rail Distance: specifies the distance from center-of-rail to center-of-rail, in meters or feet.

Configuration variable: CIVIL_RAIL_CENTER_CENTER_DISTANCE

Inside Rail to Inside Rail Distance: specifies the distance from the inside of the rail to the inside of the rail used to compute the position of rails.

Configuration variable: CIVIL_RAIL_INSIDE_INSIDE_DISTANCE

Virtual Transition Length: specifies the length over which to apply cant transitions when a transition spiral is not present, for example at very low speeds, perhaps in a railyard. When this value is zero, only a single point is added to the begging and end of the curves.

Configuration variable: _Cant_VirtualLength

Percent on Linear: applies to what percentage of the Virtual Transition Length is placed on to the linear element.

Configuration variable: _Cant_OnLinear

Cant Lookup Table

Cant lookup table can be created using Project Explorer > Rail Settings > Cant Tables. Cant tables can be defined as part of a user workspace as standard libraries or in the active dgn file.

A cant lookup table is a two-column text file that correlates curve radius values with cant values. The radius-cant pairs are listed by increasing radius. For any given radius, the software applies the cant corresponding to the largest radius that is less than or equal to the curve radius. For example, using the table shown here, a curve with a 1500-meter radius would be assigned a cant value of 200.0 millimeters.

You can add new cant table by right clicking the Cant Tables listing. Similarly you can add new entries (rows) to the table by right clicking the cant table name. Name field in the table entries can be any user defined text. Radius value defines the radius (meter or feet), and cant value defines the applied cant (millimeter or inches) for that radius.

The user also has the option of creating an Italian Cant Table, which does not use the standard formula and rounding.