Yeah, that's literally how you bring guns on airplanes.

The story is "Amtrak changing its policy to be the same as how you fly with guns."

Sometimes people travel for hunting, or to go to a shooting competition. This means that there are clearly defined rules on how you can use Amtrak to travel to those events legally.

Can they not unlock the cases while on board?

While I disagree with it entirely, I think the only safe bet is for everyone in amerikkka to have a loaded weapon on them at all times.

I very very much think the result will be the best for everyone, mostly outside of the USA.

From what I understand Americans like carrying their guns around. So if trains want to be a viable alternative to cars people need to be able to transport their their guns on them.