BritishRail.tv
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A very rare occurence of diesels on the Seaford branch when in the early hours of the 21st August 2008 two DRS class 37's ran a Network Rail test train...
http://www.britishrailways.tv/british-railways?task=viewvideo&video_id=1654
http://www.britishrailways.tv/british-railways?task=viewvideo&video_id=1654