This image isn't very large, 5 inches by 3, and the original is pale and indistinct. A little fiddling in Photoshop darkens it and allows a proper look at the signal Alan was photographing. Sadly, no details of the location are available, but it's certainly an interesting angle to look at the mechanism.
More than likely it’s ex GN or M&GN territory. The last somersaults in daily use were at Heckington on the Skegness branch and there is a fair group in use at Wansford on Nene Valley
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