37605 and 37611 on the rear work the test train from Immigham - Derby, moments after this shot the sun went in and was hit by a heavy snow storm so got lucky!
DRS class 37's top and tail a Network Rail test train working from Derby to Ilford.
37612 leads a SERCO test train from Derby to Ilford(London) over 14 arches viaduct, south of Wellingborough.
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