Having read about the Mathieson Models wagons and having seen on-line their three link coupling system, I ordered a pair of wagons and some three links to give them a go.
The plan I had was to see if it was firstly possible to use to link up Farish wagons without too much hassle. The photos show the couplings fitted on a pair of Farish 3 plank BR wagons. No modifications have been made to the wagons other than having the coupling boxes removed. The Mathieson couplings have had the fixing lugs fettled by bending inwards to fit and then the whole has been glued in place. I don't think there would be a hassle in reversing the process should it be required.
I subsequently tested a rake of 4 of these (so three sets of links) on a reverse curve of Kato 348mm track and both pushing and pulling didn't cause any hassles.
Other experiments have involved closing the gap (presently 3 mm which is a bit big although narrower than the normal Farish one) and this has been with a Farish PoW wagon. The locating holes for the coupling box are used for a guide and 1.2mm holes drilled aft of each of the holes. This brings the hook closer to the buffer beam but I haven't done another to see how it goes.
The third experiment was soldering a coupling onto the re-chassied Chivers LMS Long Lows mentioned months ago - about the time Mathieson first brought out their links. A bit of fettling and they soldered happily enough onto the DG locations and again, have traversed the reverse curves in both directions. As my layout has a 15inch standard minimum, I am well pleased. Just have to work out the position to the loco now and determine the length of spaghetti which can be handled.
Further pics tomorrow.