Editing the Design Speed of an existing alignment

[jfengineering]

I have an existing alignment defined and need to change the design speed from 60mph down to 25mph. When I go into the Alignment Properties, Design Criteria tab, C3D won't let me edit the design speed. I can add a new design speed, but I can not edit the station or design speed for it either. If it matters, the Constraint Editing tab has the Lock all parameter constraints checked and grayed out.

[Joe-Bouza · Accepted solution]

Is it possible you are trying to edit a Data Shorcut of the alignment? If so go to the source drawing to edit

[jfengineering]

That's it! Those things are going to be the death of me! 🙂 Thanks!