This cache is placed on the bridge that once carried the railway line to Radyr maintenance yard.Radyr was originally a major railway junction and the location of sidings forming a marshalling yard for freight trains used in the industries in the Glamorgan valleys.The bridge has now been paved over and the yard redeveloped into a housing estate.
As previously stated this area is very busy all year round so a lookout might be advisable as cache is very exposed once discovered.
Hope you have as much fun finding this as we did setting it!