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The train source is part of the unit. The source interface is available via the train interface.

Source interface
The source is made up of:
•A unique Identifier.
•A Type for which the possible values are:
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•A Height, a Reference speed, a Slope.
•A Horizontal directivity for which the possible values are:
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•A Vertical directivity for which the possible values are:
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•A Spectrum. The value '-99.9' = undefined.
A source can be created (but this should be avoided because it is very difficult to know what its features are) by entering a unique identifier and then by using the 
 button. The fields then become accessible.