Let him take his time. Patience is fundamental. Also, he doesn't have to release a test train.
Final thing: This train would be unplayable for some users, it would kill FPS for a lot of users, and for a few of us, it wouldn't even make our system sweat. I think Riklabs should be a bit more selective on who he might want to BETA test this train, because it is a waste of his time to send BETA copies to people who can't even use the train