I’ve been in the hobby about 5 years and built a large layout (OO scale), purchasing mainly my young sons favourite loco models in Hornby railroad where possible (Mallard, Eurostar etc) or older second hand (class 37,55 etc). For me it’s more the modelling that floats my boat. We recently assembled an n scale layout and I bought an Arnold (which I believe is a Hornby European brand) set. It has a little metal shunter with couplers either end which pop up when you first move. This allows coupling, moving and decoupling wagons. The result is he spends forever and a day playing with this. This is great, I’d like to move the idea onto some of our OO scale layout and locos. Has anyone heard of this as a retrofit to say a class 8 (we have an old Triangle model) to be used on wagons and turnouts. The only DC one i can find is the (I think it’s DC) Dingham Autocoupler. Any ideas welcome on my options, thanks.