Nice video man I'm glad you're enjoying it 😎. btw you don't have to chain player launchers like that because players will bounce automatically off the bounce pads and directed bounce pads just like items.
It's the very first release for the train ramp so I'm sure there's some bugs I gotta work out, my best guess for what happened to your artillery train was that you had so many hooked together that eventually one wagon was too slow to hook back up with the others upon landing, unfortunately because of how Factorio works that means it'll stop immediately to a halt on the rail and then the next wagon after it crashed into it destroying both wagons and the rail and then all following wagons just crashed into the ground because there's no rail anymore.
If you don't mind I'll link your video on the info page, I like how it's thorough but also very concise
