https://pin.it/cn32wici6zu63t

I kind of like this for a concept. 

Hes a preacher, for going guns to speak the words of peace, of unity, of god. A mountain of a man who services the church cars of a train, speaking the gospel.  Naturally he has had a horrible backstory of a gruesome train robber himself and so he must be armed with a rail hammer, ready for when his past comes back to claim its price in blood.  Seeking redemption he lives a life of piety and offers care and protection to his flocks.

He might have a son he travels with to add another layer of depth.