Overview

Rail transportation is a mode of moving people or goods using vehicles that run on fixed steel (or sometimes other material) tracks, typically pulled or powered by locomotives or self-propelled railcars.

Wheeled vehicles ride on parallel rails, which guide the vehicle’s direction and reduce friction compared to rubber tires on pavement — this is part of why trains can move very heavy loads efficiently.

  • Freight rail – hauling bulk goods (coal, grain, chemicals), intermodal containers, automobiles, and other cargo over long distances, often by private railroads (e.g., Union Pacific, CPKC, BNSF).
  • Passenger rail – moving people, which further breaks down into:
    • Commuter rail (e.g., Metra) – regional trips between suburbs and city centers
    • Intercity/long-distance rail (e.g., Amtrak) – trips between cities
    • High-speed rail – trains exceeding roughly 125–150+ mph on dedicated tracks (e.g., Japan’s Shinkansen, France’s TGV)
    • Urban transit rail – subways, light rail, and trams within a city
  • Industrial/private rail – short lines and spurs serving factories, ports, or mines.

Rail is valued for high capacity, energy efficiency per ton-mile or passenger-mile, lower emissions compared to trucking or driving, and the ability to move large volumes reliably over land.

Underlying engineering
Rail transportation depends on infrastructure like tracks, ballast, ties, signaling systems, switches/turnouts, and rolling stock (locomotives, freight cars, passenger cars) — all areas covered by railway engineering, which is the discipline focused on designing, building, and maintaining that infrastructure.