The secondary, parallel railway can be added to previously inserting the primary railway by using the Draw Parallel Track command from the Cross Section panel.
Continue with Cross Sections Ribbon panel.
Set the main alignment as an active alignment.
Click on Draw additional track icon.
In the Insert parallel axis dialog box, define source data: layout and longitudinal profile data, select the parallel alignment in the axes list, define the first and the lase cross section.
If the boxes Heights and Distance are checked, the elevation text and the text that describes the distance between the railway edge and the axes will be inserted in the selected rubric.
If you want to label lanes names in the table, select the Draw track labels in the rubric option.