Railway Design
When alignments have been created, you can begin to build model of the entire railway surface. In Bentley Rail Track, templates are used to define the cross-sectional geometry of the railway. A template consists of points and components that, taken together, represent a cross section of the rail surface.
e surface of the track is defined by placing templates at intervals along the alignment using the elevations defined in a vertical alignment. Each point in the template is connected between the template drops to create longitudinal surface features defining the proposed railway.
A template can be comprised of four types of objects: Closed Components, Open Components, End Condition Components, and Null Points. Creating a design using a template is very basic in that it simply applies a consistent cross-sec
an alignment. For a complete discussion of the other
definitions and modeling features, see the online help topic for these respective commands. Or, you can review the
Roadway Designer Tutorial XM PDF for a detailed workflow on defining templates. Additional information is also available from the Create Template online help topic.
In this chapter, you will work with a template library
containing different components to build a template for a single track. These files have been provided for you. The template will contain a closed component representing a Ballast layer, and open components and end conditions that represent the
grade surface.
At the end of the task, you will save the template library to disk. Template libraries allow you to save templates so that they can be accessed by different users or on different rail design projects.
Using Templates in
When alignments have been created, you can begin to build a model of the entire railway surface. In Bentley Rail Track,
sectional geometry of the railway. A template consists of points and components that, taken together, represent a cross section of the rail surface.
e surface of the track is defined by placing templates at intervals along the alignment using the elevations defined in a vertical alignment. Each point in the template is connected between the template drops to create longitudinal surface A template can be comprised of four types of objects: Closed Components, Open Components, End Condition Components, and Null Points. Creating a design using a template is very
section along an alignment. For a complete discussion of the other
definitions and modeling features, see the online help topic for these respective commands. Or, you can review the InRoads
for a detailed workflow on templates. Additional information is also available In this chapter, you will work with a template library
containing different components to build a template for a single vided for you. The template will contain a closed component representing a Ballast layer, and open components and end conditions that represent the At the end of the task, you will save the template library to
allow you to save templates so that they can be accessed by different users or on different rail
Before Getting Started
Locate the tutorial data in Files\
Loading Your Files 32. Go
load the product “Bentley Rail Track”.
33. From
rail_tutorial.dgn 34. Click File > Open.
35. Set the directo Files
36. Select 37. Select 38. Select 39. Select
40. Click Cancel to dismiss the dialog box.
Creating a T
Before you define the template, review the template that has been provided for this topic.
1. Click Modeler > Create Template.
2. In the Template Library list, double to e
3. Right
the folder name, enter 4. Right
New > Template. For the template name, enter Track
Before Getting Started
Locate the tutorial data in C:\Program
\Bentley\Tutorials\Rail. Extract RailChapter16.exe Loading Your Files
Go to Start>Programs>Bentley>InRoads Group XM and load the product “Bentley Rail Track”.
From C:\Program Files\Bentley\Tutorials\Rail rail_tutorial.dgn or rail_tutorial.dwg file.
Click File > Open.
Set the directory to C:\Program Files\Bentley\Tutorials\Rail.
Select railm_tut.xin, and click Open.
Select singletrack.alg, and click Open.
Select existing.dtm, and click Open.
Select rail_tutorial.itl, and click Open.
Click Cancel to dismiss the dialog box.
Creating a Template
Before you define the template, review the template that has been provided for this topic.
Click Modeler > Create Template.
In the Template Library list, double-click on the top folder to expand the template library.
Right-click on the top folder and select New > Folder. For the folder name, enter Single Track Template
Right-click on the Single Track Template folder and select New > Template. For the template name, enter
Track.
RailChapter16.exe.
to Start>Programs>Bentley>InRoads Group XM and Rail open the
Before you define the template, review the template that has
click on the top folder
click on the top folder and select New > Folder. For Single Track Template.
click on the Single Track Template folder and select New > Template. For the template name, enter Single
The Single Track template will be created by dragging-and-dropping components from other templates into the Single Track template. These components have already been created.
5. With Single Track remaining the active template, click on the Ballast folder, then click on the ‘single track ballast’
template.
Note: When browsing to the ‘single track ballast’ template, it is important to only use single-clicks when identifying the template so that the active template does not change.
When the ‘single track ballast’ template is highlighted, it will show in the preview window in the bottom left hand corner of the Create Template dialog.
6. Go to Tools>Dynamic Settings, and set the X and Y step to 1.0.
7. From the Preview window, click on the top center track point of the single track ballast template (point will be highlighted by a cyan box) and drag the components to the
0,0 point of the Single Track template, then drop the components in the new template.
8. Fit the view.
9. Now browse to the End Conditions fol on the 2:1Fill template.
10. Click on the top point in the fill component in the Preview window and drag the component into the template window.
11. While still dragging the component, right template window and select “Mirror”.
Notice that now a left and right fill slope are able to placed in the template window.
12. Now hover the cursor over the “subgradeR” until the point turns white and bold, then drop the fill slope slope
component on that point.
0,0 point of the Single Track template, then drop the components in the new template.
Fit the view.
Now browse to the End Conditions folder, and single on the 2:1Fill template.
Click on the top point in the fill component in the Preview window and drag the component into the template window.
While still dragging the component, right-click in the template window and select “Mirror”.
Notice that now a left and right fill slope are able to placed in the template window.
Now hover the cursor over the “subgradeR” until the point turns white and bold, then drop the fill slope slope
component on that point.
0,0 point of the Single Track template, then drop the
der, and single-click Click on the top point in the fill component in the Preview window and drag the component into the template window.
click in the
Notice that now a left and right fill slope are able to placed Now hover the cursor over the “subgradeR” until the point turns white and bold, then drop the fill slope slope
13. Follow the same steps to place the ‘2:1Cutw/ditch’ end condition onto the same point.
14. Select File>Save to save the new template to the ITL file.
15. Close the Create Template dialog.
Creating a Railway Corridor
Now that the template has been created, it can be applied to the design horizontal and vertical alignment. Click Edit.
1. Go to Modeler > Roadway Designer.
2. Select Corridor > Corridor Management.
3. For the Name, enter rail_cant.
4. For Horizontal and Vertical alignment, select ‘centerline’
and ‘existing grade’ respectively.
5. Click the Add button and the corridor is created.
6. Close the Manage Corridors dialog.
7. Select File > Save As
8. For file name, enter rail_tut, and click Save to save the IRD file to the disk.
Dropping Templates
Once the corridor has been created, you can apply the templates to the horizontal and vertical alignments.
When a template drop is specified in the corridor, the template is copied out of the ITL file and placed inside the IRD file.
1. Click Corridor >
2. For Interval, type
3. In the list of Library Templates, expand the folders by double
in the Single Track Template folder.
4. Highlight the “Single Track” template, then select the Add button.
5. Close the Template Drops dialog.
Now the template and existing surface display in the cross section view on the right side of the Roadway Designer dialog.
6. Use the station forward and back buttons to move along the alignment and review the so template at each drop.
Note: If you can not see the entire template drop, right click in the cross section view and select Display Properties, then select Fit Solution.
Once the corridor has been created, you can apply the templates to the horizontal and vertical alignments.
When a template drop is specified in the corridor, the template is copied out of the ITL file and placed inside the IRD file.
Click Corridor > Template Drops.
For Interval, type 10.0.
In the list of Library Templates, expand the folders by double-clicking and browse to the “Single Track” template in the Single Track Template folder.
Highlight the “Single Track” template, then select the Add button.
Close the Template Drops dialog.
Now the template and existing surface display in the cross section view on the right side of the Roadway Designer dialog.
Use the station forward and back buttons
to move along the alignment and review the solution of the template at each drop.
Note: If you can not see the entire template drop, right click in the cross section view and select Display Properties, then select Fit Solution.
Once the corridor has been created, you can apply the templates to the horizontal and vertical alignments.
When a template drop is specified in the corridor, the template is copied out of the ITL file and placed inside the IRD file.
In the list of Library Templates, expand the folders by clicking and browse to the “Single Track” template Highlight the “Single Track” template, then select the Add
Now the template and existing surface display in the cross section view on the right side of the Roadway Designer
lution of the Note: If you can not see the entire template drop, right click in the cross section view and select Display Properties,
7. In the Roadway Designer Dialog, select Tools > Options.
8. In the Display group box, turn ON Null Points.
9. Select OK,
10. Step to the next station and observe that the rails and centerline are now displayed.
11. Select File > Save in the Roadway Designer to save the IRD.
12. Click File > Exit and exit your CAD software, or continue to Chapter 17, Generating Design Surfaces Using Roadway Designer.
16
Overview
In this final chapter, you will generate a railway model using the information previously defined for this tutorial. All of the information required to create a railway model has been included. This data includes: the cant alignment;
superelevation range and pivot points for the ballast; rail layers for a single track; the typical section; and the roadway definition. All of this data is brought together to form the model using the Roadway Modeler command.
As the command processes,
DTM for each layer defined in the templates specified in the first roadway entry. You can treat these new DTMs as any other surface; that is, you can generate contours, cut cross sections, compute volumes, and save the inf
Bentley Rail Track
Before Getting Started
Locate the tutorial data in Files\
Loading Your Files
41. Go to Start>Programs>Bentley>InRoads Group XM and load the product “Bentle
42. From
rail_tutorial.dgn 43. Click File > Open.
44. Set the directory to Files
45. Select