Change the Length of Rails and Ducts To change the length of rails and ducts, do one of the following: SOLIDWORKS Electrical 3D menu: Change Length of Rails and Ducts . In the menu, click Tools > SOLIDWORKS Electrical > Change Length of Rails and Ducts . In the Electrical Management panel, right-click a single or multiple rails and ducts and select Update length . Define the Length Select Components. Select the components to update the length. Length. Specifies the length. The selected components automatically update with the new length. Parent topicInsert Equipment under SOLIDWORKS Electrical 3D