Fun idea, I hope it works! In the states I don’t think there’s sufficient abandoned rail that’s also near population centers for this to succeed.
In the northeast there used to be a fair bit, but I think a lot has been torn up in the process of making bike paths. A lot of the small towns I grew up in still have intact tracks running between their centers, I’d love if these pods made an appearance, if only to show folks that trains can be useful to them.
That would be a neat feature. I remember in college which was in the middle of nowhere our professor was trying to promote a bike trail between the two closest towns, because there used to be train tracks going through. Good to get anything, like a recreational path, but I’d prefer transport that serves commuting needs too.