Comment by hiAndrewQuinn

Oh, this is an area I know something about. I work on railway software in my day job.

Broadly speaking you are correct. Expertise like mine is rare and fleeting mostly because you can only really build it long term by working at a company which can convince international clients to take them on. Even large countries tend not to have more than a handful of trains being built on any given day of the week.

This is one place where having a business located in a nation long known for its relative neutrality, calmness and international trustworthiness can pay off. All of the Nordics are good at this, really.