How did railroad transportation growth impact population growth in a “reciprocal” way? Responses It caused life expectancy to increase due to greater access to health care professionals. It caused life expectancy to increase due to greater access to health care professionals. It further connected populated areas and brought in more people. It further connected populated areas and brought in more people. It provided new immigrants to the United States with free rail passes to live in new “railroad towns.” It provided new immigrants to the United States with free rail passes to live in new “railroad towns.” It forced people to move off the rail line to escape the noise and air pollution produced by steam locomotives. It forced people to move off the rail line to escape the noise and air pollution produced by steam locomotives.