I'm glad that MTH PS3 engines no longer use the pigtail connectors between powered A units and non-powered (dummy) B and A units. However, now the only way you can remotely fire the rear protocoupler of a A-A or A-B-A engine is to have lashed-up trailing A unit. All B units are total dummies and cannot have a protocoupler. For those of us who prefer A-B or A-B-B engine configs then there is no way to remotely fire a protocoupler on the tail unit. If you fire/release the rear coupler on a PS3 engine like a F3 or E8 any coupled B or A units will disconnect along with your consist. Not very realistic.
So.... what if you modified a B unit to connect to your A unit using a MTH PS3 steam wireless drawbar. Remove the protocoupler from the back of the powered A unit. Then wire the drawbar receiver in the A unit to the the protocoupler wire. Then replace the dummy coupler on the back of the dummy B or A unit with the protocoupler from the powered A unit. Then wire the protocoupler in the dummy B unit to the wireless drawbar. End results should be a powered A with dummy B or A connected via a wireless drawbar that lets you fire/uncouple the protocoupler at the tail end of the dummy A or B unit.
What do you think as a hack/mod for PS3 A-B-A/ A-B engine units. Not applicable to lashed up powered units.