Here’s what I think. There should be 11 of them, and on an 11 year cycle they should be directly elected by the people 1 per year, 11 year term, 1 term limit. They should be selected from a pool that is made up of high level judges in the country, and the members of that pool who decide to run for the position need to pass some sort of test by an independent board of constitutional scholars.
As the Supreme Court makes rulings, rulings that allow or affirm a right or action should be set in stone and no longer challengeable unless the entire panel of 11 judges unanimously decide that the issue needs to be reheard.
Something like this anyway, I’m sure there is more to consider but this is the general idea that I think would work.
Not really defending our horrid rail system here, but there is a massive amount of rail line missing from the US map. I work in logistics, I do a lot of rail related work.