The Brown Engine is one of the eight companies that make up the Mining Consortium in Keldagrim. The company only accepts male players. Female players can join any of the other companies, including The Yellow Fortune, which exclusively hires women, except The Red Axe, which does not accept humans.
During The Giant Dwarf quest, you can choose to help this company by gathering materials, primarily ore and bars, for its head secretary. After which, you can do some tasks for the director. The director will then let you join the company as a member, so that you can choose him to have a stone head of his image carved onto the giant statue that is in the middle of keldagrim.
Also, in Forgettable Tale..., you can ask him to help you remove the boards blocking a railway tunnel.