I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Cullen viaduct is a category B listed structure with eight arches, built to carry a single track, constructed in 1884 and approached by substantial embankments.
These structures were saved from demolition and now form part of a cycle route.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 08/08/2020. It remains the responsibility of any pilot to check for any changes before flying at the same location.