Because of the large amount of labour saved by giving workers specialized tasks in Industrial Revolution-era factories, some classical economists as well as some mechanical engineers such as Charles Babbage were proponents of division of labor.
Explanation:
the US government might support the road because they might be able to use the railroads to transport materials for men at war or other materials the country might need.
A lumber producer in New Brunswick might support it because the railroad will require wood for the tracks. The lumber producer can profit from this because the railroad would need a large supply of lumber. They can also use it to transport the lumber.