Engineer-Joe's comments prompted me to start over. I powered up and the engine was gone from the remote. So, I put it back on the test track and started over. Powered up and it read the engine, but ID'd as my NW J611. Everything worked, but it hijacked that ID. So, I deleted the J611 then powered up the test track again and it found the Triplex. So far so good. Then I transferred it to the layout, crossed my fingers, and "Eureka!" it started up as the Triplex:
Thanks for all the help.