Out take from series 13 in which Richard Hammond and James May race the new Porsche Panamera against a Royal Mail train. In this clip, Richard finds out how effective the seat heaters are, and then makes sure James does too! Go to    / topgear   to see a full list of all high quality videos available on the Top Gear YouTube channel and don't forget to visit http://www.topgear.com for all the latest news and car reviews.

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