I bet it’s the same reason there’s a lot of GNC people in Linux communities. Trains and Linux similarly attract many autistic people, and autistic people tend to be less attached to gender roles (correlation not causation). It’s speculated that as a result, autistic people tend to be more likely to explore their gender identity (this bit hasn’t been studied yet afaik) and then you end up with trends like this. Train drivers and programmers are all femboys and trans people