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Entering & editing of railroads

The calculation of the emission is based on the selected guideline (menu Calculation | Configuration, tab „Standards“). In this chapter the calculation procedure „Schall 03 (2014)“ is used for the explanation of railways.

Entering a Railway Track

In this example a straight railway line with two tracks having each a traffic of 10 electric local trains during the day and 4 at night, each consisting of an electric locomotive with disc brakes and 8 cars.

  • Select the object „Railway“ from the toolbox.

  • Select a scale of 1:1000 and click with the mouse to enter the first polygon point of the railway.

  • Move the mouse to the right and clicking at a second location.
  • Click the right mouse button to exit the input mode.

  • Change to the edit mode by clicking the arrow object in the left top corner of the toolbox.

  • Double-click with the mouse on the railway’s axis. The dialog Railway (Schall03 2014) opens.

Dialog Railway (Schall 03 2014), „Train Classes and Penalties“ selected

Specifying Emission

The emission of railways is alternatively defined by:

  • The emission spectrum Lw‘ (PWL‘) for the time periods Day/Evening/Night or
  • by referring to a local or global list „Numbers of Trains“ specifying the counts per train class during Day/Evening/Night.

Local List „Numbers of Trains“

To enter a local train number list for the currently selected rail route, proceed as follows:

  • Activate the option „Train Classes and Penalties“ on the dialog Railway.

In the upper right part of the dialog, the selection "List of trains" is set to "(local)" by default. In this case, the input of the number of trains/loc/cars is done in the following sub-section of the dialog:

  • Insert two new lines to the sub-table „Train Class“ via its context menu or using the „Insert“ key.
  • Double-click into the first new line.
  • Select the locomotive „ELOK_SB Locomotive, Electric CAT7, disc brake“ and enter figures as shown below (day=10, evening=0, nigh=6):

  • Use the arrow symbol „->“ to go to the next entry of the List of Trains
  • Select the locomotive „RZW_KB Passenger Car CAT9, block brake“ and enter figures as shown below (day=10*8=80, evening=0, nigh=4*8=32):

  • Close the dialog Train Class with OK.

The emission spectrum and A-weighted values for day and night are displayed on dialog Railway.

Dialog Railway after inserting local number of trains

  • Close the dialog Railway.

Parallel Track

  • Click with the right mouse button on the railway track and select the command Parallel Object from the context menu.

  • Select the object type "Railway", enter a distance of 6 meters to the left and click OK.

  • Change to the edit mode .

  • Double-click on the new, parallel railway track and check out the new object. The emission data was copied correctly from the original railway.

Configuration|Railway tab

If the guideline Schall 03 (2014) is selected, following options are available by default on the "Railway" tab:

Entering a Receiver

  • Close the dialog Railway and select the receiver from the toolbox.
  • Enter a receiver North of the railway track and click in edit mode on the receiver’s border with the right mouse button.

Generate Rays

  • Activate on the lower part of the dialog the option „Generate Rays (as Aux. Polygons)“.
  • Start the calculation by click on the calculator symbol on the symbol bar.

Tracks and receiver point with ray representation

It is obvious from the representation that the two railway tracks, each representing a line source, are segmented into sections. Every segment is replaced by a point source in its center.

  • When double-clicking the receiver the daytime and the night-time levels are displayed.

Defining a Calculation Area

  • Select the object „Calculation Area“ (symbol ) from the toolbox and define a calculation area including the railway objects and the receiver.

  • Adjust the grid spacing to 1x1 meter (menu Grid|Properties).

  • Calculate the grid (menu Grid|Calc Grid).
  • Use the object „Level Box“ (symbol ) to display the level at individual locations on the grid.

Level grid (daytime Ld) for a railway line with two tracks

Defining a Parallel Barrier

  • Click with the right mouse button on the - in this example - upper railway track and select the command Parallel Object from the context menu.
  • On dialog Parallel Object, enter a distance (aside of the railway's axis) of 3 m and a height difference of 5.4 m.

Note

Since the source height of the railway is set automatically to 0.6 m above the rail’s top edge, the height of the barrier’s top edge is located at 0.6 + 5.4 = 6 meter.

Note

The option "Station Range" enables to restrict the barrier’s length to a range of stations.

  • Recalculate the grid (menu Grid|Calc Grid).

Level grid (daytime) for two railway tracks with a parallel barrier

Vertical Grid

  • Select the object "Vertical Grid" from the toolbox (symbol ).

  • Draw a line from two polygon points perpendicular to the railway track (approximately in the middle of its length).

  • Switch to the edit mode (symbol ).

  • Double-click the vertical grid to open its dialog.

  • Deactivate the option „Global“ behind the „Appearance“ button and set it to „Lines of the Equal Sound Level“ and activate the option „Level Range“.
  • Click the button „Calculate“ in dialog Vertical Grid.
  • Click after completion of calculation with the mouse into the lower part window and zoom in the vertical grid using the mouse wheel.

Vertical grid, grid appearance „Lines of the Equal Sound Level“.option „Level Range“ activated

From the graphics it becomes obvious that the emission lines are above the terrain’s level. On dialog Railway|Geometry it can be checked that the source height is set by CadnaA to 0.6 m above terrain automatically (i.e. the rail’s top edge).