I also looked for the support info for the vista dome cars. There is none! No app, no manuals, nothing! They use the same app so I guess Lionel has decided that this product line is not worth carrying forward. I found the APK file here:
https://apkpure.com/lionel-wif...g.Lionel_WiFi_Camera
It was a struggle to get my tablets permissions in line with the apps needs, but I got it to work. In the past I used another app on my PC which worked adequately but not as well as with my new replacement tablet.
Rolland