Building through landscapes
Rail construction altered rivers, forests, wetlands, mountains, and wildlife habitat through grading, bridges, tunnels, cuts, fills, and settlement along routes.
Fuel and pollution
Steam locomotives burned large quantities of coal or oil. Diesel locomotives reduced some operating burdens but still produce emissions and noise.
Freight efficiency
For suitable long-distance freight, trains can move large quantities with less fuel per ton-mile than highway trucks, one reason rail remains important in transportation and climate discussions.
Modern challenges
Railroads continue working on locomotive efficiency, alternative fuels, battery and hybrid concepts, idle reduction, and infrastructure improvements.