Z851 was built by the Swiss manufacturer Stadler. and was introduced new to this line in 2008. They operate via 850V third rail DC pick up that is quite remarkable given the weather as seen here. Indeed, the third rail can be seen clear of all snow to the left of the train. If this was on our own Southern Region, all tarins would have been halted by now with absolute chaos ensuing! It looks like that the third rail is heated as there appears to be no snow on it.
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