Problem Solving Problem (The Engineer) Can Anybody Answer this Question?

Three businessmen - Smith, Robinson, and Jones - all live in the Leeds-Sheffield district. Three railwaymen (guard, stoker, and engineer) of similar names live in the same district. The businessman Robinson and the guard live in Sheffield, the businessman Jones and the stoker live in Leeds, whereas the businessman Smith and the engineer live halfway between Leeds and Sheffield. The guard's namesake earns $10,000 per year, and the engineer earns exactly one-third of what the businessman living nearest to him earns. Finally, the railwayman Smith beats the stoker at billiards. What is the engineer's name?