Select the ‘Structure Place’ button from the Linear Draft toolbar and follow the prompts.
At this point you should select one marker.
After selecting the marker point, accept the choice by right clicking the mouse button. A new prompt will appear asking you to select the rails.
Left and right rail selection will define the orientation of the structure and its annotation box, therefore, the left and right rails must be chosen as if you were looking at the rails in direction of increasing chainage.
In the example below, the chainage is increasing from right to left.
Accept the rail selection by left clicking the mouse button. Once accepted, another prompt will appear asking you to select the right rail. The right rail for a TTC will be the right rail of the 2nd track.
Accept the selection by left clicking the mouse button and the ‘Create Structure’ form will appear.
Choose type 'TTC'.
The ‘Create Structure’ from for a TTC will have additional information compared to a STC, as there is now a boom/gantry that can be edited. Also note that the ‘Track Details’ section of the form displays that there are 2 tracks associated with the structure.