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And, crucially, no-one cares about the economics. Dubai has never paid too much attention to that with mega projects.

If built, it would compete directly with Etihad Rail, which is building a regular rail network throughout the entire UAE and already has its first phase operational:

https://en.wikipedia.org/wiki/Etihad_Rail

This focuses primarily on cargo, but is built with passenger trains at up to 200 km/h in mind. And most Hyperloop business plans also seem to rely heavily on freight.

Interesting. The locomotives are Diesel-electrics made by what used to be a locomotive recycling company in the US. Then Caterpillar bought them, and they now have some decent products, apparently. The railroad's main job is transporting mined sulfur to ports for export.

This is a total contrast to "hyperloops". It does a useful but boring job with useful but boring technology.

If you've found info on its progress as recent as January 2020, you're doing better than me.