You are from the market town of Houndsmoor, along the
railway line that runs from Taunton to Minehead. You aren’t
well educated, but you know the area very well. And you
own Houndsmoor’s station bus (a horse-drawn cart for
passengers).
You have sometimes in the past aided The Constable
from Houndsmoor, and they’ve employed you once again to
provide transport to the nearby village of Wivelscombe. The
constable has brought along The Detective from Baker's Gap,
along with (perhaps) The Occultist. You may have a couple
of other passengers as well.