I always wonder if 2 identical models will talk to each other. Others in the past said it is possible. I tested out the theory to see what is said between the 2 identical models. The answer is yes and no. The only time the engine will talk to each other when both are facing each other and with some gap between them.
My Trackmaster/Tomy/Plarail Photo Gallery Page (over 600+ photos and still under construction)
https://www.flickr.com/photos/183311600@N03/
https://www.flickr.com/photos/183311600@N03/