I understand the CO2 emission bump during the early days of railroad, since most steam engines would be burning coal. However, just like how you can mitigate power plant emissions via tech upgrades to a cleaner source, the same should be said of railroads as engines evolve with the same cleaner techs. That said, even if railroads produced less CO2, the main issue arises: why bother to make them at all? We have all adapted to a civ game without railroads for the past two years, and now that they are back, the benefits are lackluster. I agree with the above in that they should either increase land route yields, or somehow increase city yields, like production or gold. On a related note: please fix the road graphics, Firaxis. The game is visually becoming a mess, which is sad given how outstanding it usually is.