Lionel NYC Alco PB Unit 6-19080

Are you programming the two units together as a lash-up in TMCC? If so the default setting is that sounds only come from the lead engine. Under Legacy there's a way of getting sounds from all engines but frankly I can't recall any way of doing this with TMCC engines. I'll check and try to remind myself. 

UPDATE:  After a few tries, I FINALLY was able to program the B unit in sync with the A.  Took a few tries but it worked and the 2 units together sound AMAZING!!!

Wasn't that an episode of "The A-B Team"? 

"I pity the fuel . . ."

Excellent news and I agree that two units running together with sound in both produces very satisfying effects. I won't ask how you finally did this as I know there can be issues getting TMCC programming to "take" on the first try although it really should be easier than it often is. Legacy B units with sound now normally have switches to control the sound output, which is important because some signal sounds and crew talk don't always sync. 

So quick update...the B unit WAS working in concert with the A and then, without warning, failed. Works fine in conventional though and sound GREAT together. My friend, who previously owned them, had even installed these crazy smoke units that can fog up a room that work on track power only. Tried a few times to re-program it to the A unit to no avail. Based on a previous comment from rtraincolector *thanks for the tip*, gonna try again WITHOUT the A unit in sight or on the track and see if that remedies it...STAY TUNED.

Ok so here's another update on this dilemma. Just last night, I was able to re-program the "B" unit to work in a TMCC environment with the "A" however, the signal to the B unit ONLY is getting lost somehow. My friend and I took the shell off the B unit and confirmed the wire from the antenna was still attached to the metal plate that IS the antenna AND was installed in the proper pin on the plug that plugs into the board. What happened next is the BIG mystery. If you hover your hand over the antenna or hold it, the unit responds with either a Cab1 or Cab2 remote. If you remove your hand and step away, the signal gets lost. He removed it from the plastic mountings and added a wire to extend the antenna so we could affix it elsewhere on the shell. That worked for a hot minute and once the shell was re-attached, the signal got lost UNLESS you held your hand over the unit. This has to be strangest and most frustrating thing I've ever encountered that I'm ready to just call it a day and just use it in a conventional environment OR buy another one of these B units just so I could have one that works. It seems to me that the original owner must've tinkered with something that threw a wrench in the works. Hopefully my friend can solve the mystery. Stay tuned...