"Ok, but the 50-1032 cable does not work with the Legacy Base either."
Just received a new 50-1032 cable from Amazon today. Connected it up to the Legacy Base and the Y cable splitter into the TIU and the WiFi Interface. Everything is working perfectly for TMCC Lash-ups and Locos. I have to admit the cable is the last place I would have looked as I stated earlier in this thread, but there it is. The first cable is just dead as a door nail and cost refunded by Winkie's Toy and Hobby.
Jim.