DCS lashup help ??

every time I start typing a guess, I answer my own question from your description, like....

The same TIU is on the test track and the layout, right? (it's in the description above)

You're pressing done after you build and name the consist? (you have to I believe)

Can you build and get the consist to move on the test track?

I've also had this issue when signal is weak. How good is your track signal?

I'm now wondering if your layout works good with more than 1 engine on the rails?

Any TMCC/Legacy equipment getting power?

What's your power supply?

I have so many questions to figure out where to go. What type track, wiring, number of drops, etc., etc.

fwiw: I cannot get any PS3 engine to operate in a lashup; they go crazy, lose programming, and I've given up. You can still run them together however using the All command, or whatever MTH calls it...I've got the instructions downstairs if you need it.

Check and make sure they are set up to go in the same direction they could be doing a tug of war. Physically disconnect them and see what happens...

I have been running with DCS for decades. I have 7 loops of track. 1 O scale 3 rail. 2 O scale 2 rail. 4 are G scale. I run consists of trains all the time on each. You need to have good signal at the rails because there is 2 way communication. Each engine reports back to the remote with each command. If 1 engine does not, it messes up the whole process.

It's not that hard as some would claim. There are rules to get good signal and if they are broken, the signal strength may suffer. I got a lot of help, from Ray's Electric Trains!

Running a large G scale layout outside with DCS is an example of what can be accomplished. I had to understand how the system works. Then, I built it and had great success. Provided clean abundant power through good wiring, and I can run just about anything.

Inside was easier. However, if I put things on the rails that draw the signal down, results can be poor.

Joe Paonessa - YouTube

I never use the "all-engine" command. It is easier if you're having issues.