It’s easy to conflate the idea that trains need investment and that Musk is the wealthiest mad on Earth. He doesn’t have enough money or the political capital to create a meaningful rail option like, say, LA to SF at high speed. His only option are promoting much cheaper alternatives like the Boring company or (inspiring for now) Hyperloop.

Even then, all those projects are far away from profitability and heavily criticised. His car business offers both a credible option to reduce ownership (with a self-driving fleet) and finances his other ideas. Overall, he’s expressed interest in fast point-to-point transport and realism about how flying would be far more expensive, energy-wise, so I’m sure that, when he has the means, he’ll look into a rail-based option.