Sadly does not meet the OP's criteria of it being a closed station on an otherwise open line.Wolferton, for Sandringham.
Beattock, yes! Cumberland Street, pass. I walked the Sunnyside Basin line in 2013 (as part of the Motherwell North Signalling Renewals scheme) and don’t recall passing any extant platforms then.
Norton Bridge platform is still there, just! In relation there's also Wedg(e?)wood and Barlaston (though their status as "closed" is up for debate).
Ditton on the North side of the Mersey still had platforms (and even nameboards) last time I went through.
Don't you mean Castlethorpe? Nothing at Hanslope or Roade.Hanslope
I stand corrected! I couldn't remember if it was in hanslope or castlethorpeDon't you mean Castlethorpe? Nothing at Hanslope or Roade.
There are probably some remnants of Shields Road but I haven't looked in passing for quite some time.Thinking about the Sunnyside one, it was probably part of the bridge rather than a platform. Few others:
Glasgow Green
Cameron Bridge?
Cobbinshaw?
Mauchline?
That's the one!Calvert; and the line is still open. Is it Castlethorpe between Wolverton and Roade Junction where the platforms lie unused for decades?
Thinking about the Sunnyside one, it was probably part of the bridge rather than a platform.
Holywell on the North Wales coast still has a platform there.
The platforms aren't there at Glasgow Cross, the bricked up staircases end in mid air.Glasgow Cross, between the present day Argyle Street and Bridgeton (which also has Glasgow Green along this section of route too).