At this location two 1'6" diameter culverts have been laid side by side to create a bridge for an access between adjacent fields. These culverts do not pass beneath the railway - they are accommodation works.
The watercourse flows through these culverts and then into the 3'0" diameter culvert behind (302470) which passes beneath the railway. The guardrail above the east end of culvert 302470 is just visible at the edge of the track bed behind the bushes in the top right of this photo.