Had a flash of inspiration. Train Wizards!
In a magical realm overrun by Necromancers and assorted supernatural rabble with the flair for the dramatic the passenger trains still need to get from town to town so each line has a crew of guardians for their trains that ensure nothing derails. These specially trained guardian wizards ride the rails and keep whatever might threaten the train at bay.
Sorry for the ass digital pastel sketch. I just needed to get train wizard out of my head.














