<Tr> <Th> Class </Th> <Th> Image </Th> <Th> Type </Th> <Th_colspan="2"> Top speed </Th> <Th> Number Operated </Th> <Th> Notes </Th> </Tr> <Tr> <Th> mph </Th> <Th> km / h </Th> </Tr> <Tr> <Td> Class 37 </Td> <Td> </Td> <Td> Diesel locomotive </Td> <Td> 90 </Td> <Td> 145 </Td> <Td> 12 </Td> <Td> Intended to operate sleeper services over non-electrified parts of the railway network in Britain . Eurostar retained three locomotives for the rescue of failed trains, route learning and driver training, but sold them to Direct Rail Services when the new Temple Mills Depot opened in November 2007 . </Td> </Tr> <Tr> <Td> Class 73 </Td> <Td> </Td> <Td> Electro - diesel locomotive </Td> <Td> 90 </Td> <Td> 145 </Td> <Td> </Td> <Td> Were used primarily to rescue failed trains . Eurostar operated two of these from its North Pole depot until 2007, when they were loaned to a pair of educational initiatives having become redundant following the move to Temple Mills . </Td> </Tr>

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