Trainz/Changing the default passengers in coaches or at stations
Clone any assets to your own kuid first.
Now look at <kuid2:86627:1731:3> and look at the queues. Note how it can accept three different types of passenger.
Copy this queue bit into anything else you want to passenger enable. You may have to add a few kuid numbers to the table at the end.
Any passenger active station can use different passenger sets. Just change the kuid for the passenger set.