The justification of the rail supports. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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| Visual Basic | 
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| Visual C++ | 
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Members
| Member name | Description | 
|---|---|
| Begin | Supports are justified to the beginning of the rail. | 
| Center | Supports are justified to the center of the rail. | 
| End | Supports are justified to the end of the rail. |