File:Hst-power-unit.jpg

Photograph of HST power unit consisting of Paxman Valenta engine, turbocharger and Brush traction alternator. The Marston cooler group is not shown.

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Fair use for Hst-power-unit.jpg
Though this image is subject to copyright, its use is covered by the US fair use laws, and the stricter requirements of Wikipedia's non-free content policies, because:
 * 1) It is a historically significant photo.
 * 2) It is of much lower resolution than the original. Copies made from it will be of very inferior quality.
 * 3) The photo is only being used for informational purposes.
 * 4) Its inclusion in the article adds significantly to the article because the photo and its significance are the object of discussion in the article.