There is only one file type that uses the .TRA extension:
WinTrack Railroad Track File

- Developer WinTrack
-
Popularity
- Category Data Files
- Format N/A
Railroad track design created with WinTrack, a German railway design program; includes the train and track layout, as well as other content, such as landscapes, trees, buildings, and cars; saved in a binary data format.
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Updated: April 20, 2009