The definition of transgender is anyone who identifies with a gender other than the one they were assigned at birth. It is therefore an umbrella term that includes nonbinary genders. Being transgender and transitioning are separate things.
That being said, when people are talking about “trans people” they often mean binary trans people (ie men and women), especially in the current political context.
It’s also not unheard of for some nonbinary people to be uncomfortable with calling themselves trans, presumably for the associations with binary trans people.
Edit: i should clarify, by this I mean transgender definitionally in the abstract. When talking about a specific person’s identity, it just comes down how they identify. If an enby doesn’t identify as trans for any reason, don’t call them trans.
This isn’t helpful, but I was actually really disappointed by the people aspect of workers and resources. There’s no agent model with people picking routes to their workplace or needs. They’re just another type of resource you shunt around with limited models of searching from transit stops.
But yeah as far as trains are concerned factorio does seem to be the best available.