New to the gauge I have my first loco (a GW Railcar) on test on a test track. I note the Graham Farish couplers are of the 'swing nuckle' type. Do all U/K manufacturers use the same type, if so, what are the snags and/or advantages? Are uncouplers available, and do they work satisfactorily? Does Dalpol and Graham Farrish stock mix? I am awaiting a delivery of Kato track which is temporarily out of stock, and meanwhile using Peco for tests.