15th April 2021, 18:05
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Senior Member
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Join Date: Jun 2009
Location: Ashen-North Essex/Suffolk borders.
Posts: 3,557
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I found something else.
According to the text on this photograph mobile test units were special coaches that could be enabled by the dynamometer car to provide a varying load.
https://www.flickr.com/photos/blue-diesels/50039922651
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Philip.
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