#49 Model railway couplings, OO gauge coupling types tested for close coupling and height difference

Three different types of couplings, how they compare with each other, and testing how closely they could two different types of suburban coaches together, as a prelude to using different couplings across the fleet. Testing out Kadee couplings, standard narrow tension locks and Hornby 'Roco' type couplings. All three types I have previously purchased from eBay.