I know I'm late to the party (again!!) but my initial reaction is that I actually like Turtle's dual-track mockup best plus the grey andesite supporting blocks of Ken's earlier post. Although that styled tunnel entrance looks très bien.
Granite looks... I dunno... not right? That salmon color strikes me as really weird to be the primary color for the railway.
One suggestion I don't think I've seen is a possible way to escape the track if needed. If you decide you want to nope out halfway to a destination, you could reach ground level if the support pillars have a ladder running down one side. Like many real-world structures, you could even omit ladders from the bottom two blocks to prevent non-spider baddies from trying to climb up.
I guess I'm going to have to go fire up a creative mode session too!
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