I only knew of a couple very small trials. I recall the cost of powering the remote node being the main problem. It cost roughly the same to power a dozen lines from the node as a whole FTTC cabinet.
I saw the first trial in North Yorkshire in progress in 2014, and the feedback via the council was indeed that power was a problem; that BT would go away and think about it, and to not expect anything for around a year (ie late 2015).
There were also FTTB trials in the city of London. No idea what happened there.
It's been over a year since I heard anything related to FTTrN from OpenReach.
We saw G.Fast trials happening, with power pushed over spare copper pairs. That would be one solution to the power problem.
We've also seen AIO cabinets appearing for infill tasks. They are perhaps sized for more lines than FTTRN nodes, but they have room for the power infrastructure too.
I went back to Codelook, to see what has happened on the Leyburn exchange since the FTTrN node went live... I feel this place might tell us what FTTRN plans have morphed into, and it seems more has happened, and more still has yet to happen:
April 2014: Leyburn had 3 EO bundles, and 9 cabinets. 5 cabs had fibre; 4 no plans.
Jan 2015: 3 EO bundles, 10 cabinets - the new one for FTTrn for 26 lines. All 10 cabs had fibre.
December 2016: 2 EO bundles, 14 cabinets named Pnn, plus 3 cabinets named E_nn. One new cabinet P11 live in July 2016 with 18 subscribers. 6 new cabs (3 Pnn, 3 E_nn) being upgraded.
January 2017: As Dec 16, plus one extra Pnn cabinet due to be upgraded.
So there has been plenty of changes planned in since the time of the FTTrN trial, which implies something has happened. One cabinet for 18 subscribers suggests FTTrn, but the remainder can't yet be pinned down.