A bridge of the sort that has an embankment topping it, crossing something called the Mor Brook.
The link shows the site on
NLS▸ maps, with Google's satellite view as the background.
Looking at the satellite photography, the date of that is stated to be 2025 (which it isn't, cos, trees in leaf) but the bridge/embankment there already looks as if something was having a chew at it.
The structure looks to be able to take double track, but at some time since the 1950s an access road to a house has been taken across one side of it, which would complicate the business of slewing the track to allow the railway to restart services, if that was acceptable from the safety perspective.
Mark
https://maps.nls.uk/geo/explore/#zoom=19.4&lat=52.49544&lon=-2.39632&layers=258&b=GoogleSat&o=100