This wiki applies to versions 2021R2 to 2025 (25.00.00.84).
Note that in 2025 release, Centerline Rail to Centerline Rail Distance and Inside Rail to Inside rail Distance have been moved from design file setting to configuration variable.
CIVIL_RAIL_CENTER_CENTER_DISTANCE and CIVIL_RAIL_INSIDE_INSIDE_DISTANCE

This is an intermediate step to consolidate Cant and Create Rails functions. The workflow doesn't change.
Configuration Variables can be changed on the fly by user before creating the rails.

Rail center Line: Create Rails command is using rail center to rail center distance as defined in the cant. Design File Settings is not used.

Rail Inside Edge (gauge): Create Rails command is applying an offset from rail center line. The offset value comes from Design File Settings. It is the difference between rail to rail center distance and gauge.
The following example will give a value of 0.034= (1.50-1.432) / 2
This value is saved with the Rail Track object but not exposed to user. If rail center to rail center distance, or inside, is wrong you must delete and recreate the rails.

NOTE that if Design File Settings and cant don't have the same rail center to rail center distance, the gauge could be incorrect. If you change the Rail Center to Rail Center distance in the cant, existing rails gauge (Inside to inside) will change accordingly, no matter the Design File Settings at that time.

• Create Rails command can create dual gauges track with 4 rails. You can apply the command twice on same alignment.
• Create Rails command can not create dual or triple gauges with 3 rails.