One of the biggest reasons Amtrak WiFi feels inconsistent is geography. Rural areas, mountains, deserts, and long stretches of countryside all have fewer cellular towers, which weakens the internet signal. Long-distance trains may pass large areas with little to no connectivity at all. When signal drops, the onboard system has nothing to distribute to passengers — resulting in slowdowns or complete connection loss.
https://amtraktrainstations.co....m/blog/does-amtrak-h