Beta tester??

Anyone know how to become one?

Beta testing what?
Beta testing of TANE SP2 HF3 is still underway. I think you can still join - post a request to the Helpdesk.
Beta testing of Trainz Railroad Simulator 2019 is closed testing - only selected individuals allowed.

Regarding what pware has said, there is a way of applying for the latter if you get the Trainz Newsletter.

Shane

Yes - you can apply for the beta testing via the latest 'TRS2019 Insider News' newsletter update sent today.
Run the benchmarks (and don't do what I did and run them without first checking your XMP settings for your system memory. Mine were inexplicably turned off.:wave