You can access this dialog from the following:

Ribbon: OpenRail Modeling > Rail Electrification > Wire Runs

User selects the overlap type from the standards and places this on the model by selecting the reference line that will be the start of overlap. Overlap is than placed based on this selection then wire runs are updated. Tool checks if there is an existing overlap that will cause a clash, and does not allow placing in such a case. Reference lines are repositioned based on the span definition in the overlap table.