Design Works for any kind of Linear projects requires the support of some Specific Software in order to produce the Detailed Design of the project Axis/es with all their details.
But this is usually only a fragment of the works that have to be performed for the needs of a project. For the parts of the Design Works, other than the Axis Detailed Design, many Engineers/Offices/Designers use AutoCAD, Civil 3d or other Autodesk Software.
Project Design always requires interaction between Project Designers. There are also Coordination Studies that need to be performed. Therefore DWG files are a common practice to expedite these tasks.