One of many large concrete troughs along one side of an old railway line, now used as a walking track. They are spaced roughly 50-100 m apart, and only appear on one side of the track where there is a small stream. No obvious bolts or other attachment points. Dad’s legs for scale.

A: The concrete objects are catchpits. They are concrete rings with a horizontal drainpipe entering on one side and another leaving on the opposite side. The bottom of the catchpit is lower than the drainpipes, so as the water flows out of the upstream pipe and into the catchpit it reduces in speed and therefore deposits any silt it was carrying into the bottom of the catchpit. The water then flows into the downstream catchpit, carrying less silt than it did previously. When the level of the silt in the catchpit reaches the bottom of the downstream pipe the silt needs to be removed to keep the system worling. This used to be dug out using shovels, (a disgusting job), but is nowadays removed by vacuum pumps. It’s a way of helping to keep the drainage system clean. The fact that there’s a stream flowing alongside shows that the drainage system isn’t working

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