Malmesbury, due to powers being revoked?
Malmesbury branch, which initially ran northward from Dauntsey on the original GWR London -- Bristol main line; a good few decades later, the new cut-off line Wootton Bassett -- Patchway (shortening the route to South Wales) intersected the branch mid-way, at Great / Little Somerford: the junction for Malmesbury was changed to Little Somerford, roughly halving the length of the branch.
No, not that.Bord na mona?
You are, if I remember correctly (I wasn’t around then), correct. However, that is not the answer to the question. I do mean the present century.I think Dublin (Westland Row) - Dun Laoghaire (then using the British name of Kingstown) was initially standard gauge, before becoming Irish gauge in 1848 when line was extended.
But that isn’t present century, and can’t think of any lines in last 20 years
Why there was a slight mistake at the beginning was that I was carefully in saying, line, not railway. I think that the rolling-stock was US-style gondolas, possibly secondhand.Then we need a clue please. Or might lateral thinking help?
No, I am afraid not.Some sort of fun railway along the beach, at Dun Laoghaire maybe?