KEEP EXPLORING
Freight trains, explained in plain English
A freight train is a moving system: locomotives provide tractive effort, railcars carry different commodities, air brakes control the train, and railroad operating rules determine how it moves over a route. This guide connects the most common freight-train questions into one place.
Start with the big questions
How Fast Do Freight Trains Go?
Typical speeds, limits and what slows a train down.
Explore speed →Why Are Freight Trains So Long?
Efficiency, traffic mix, sidings and train makeup.
Explore length →How Heavy Is a Freight Train?
Why tonnage varies so much from one train to another.
Explore weight →How Many Locomotives?
Why horsepower alone does not determine the answer.
Explore power →How Long Does It Take to Stop?
Why a freight train may need more than a mile.
Explore braking →What Do Freight Trains Carry?
From grain and autos to containers and chemicals.
Explore cargo →Why Locomotives in the Middle?
Distributed power and better train handling.
Explore DPU →How Do Air Brakes Work?
The fail-safe compressed-air system behind freight braking.
Explore brakes →How Is a Freight Train Built?
Consists, car placement, blocks and operational planning.
Explore train makeup →Freight train anatomy
A typical freight train may include a head-end locomotive consist, dozens or even more than a hundred railcars, an end-of-train device, and—on some trains—distributed-power locomotives placed farther back in the consist. The exact arrangement depends on tonnage, terrain, train length, cargo, route and railroad operating plan.
Quick freight-train facts
Speed: Mainline freight speeds vary by route and cargo; the Association of American Railroads says typical mainline trains operate around 40–70 mph.
Length: AAR reports a 2023 median Class I train length of 5,300 feet, while some trains are substantially longer.
Stopping: Depending on speed and load, a freight train can require more than a mile to stop.
Cargo: Freight rail moves bulk commodities, manufactured goods, automobiles, food products, chemicals, energy products and intermodal containers.
Authoritative references
For current industry and safety information, see the Association of American Railroads freight FAQs and the Federal Railroad Administration.
Still curious?
Ask Ask the Conductor your railroad question in your own words.
Ask the Conductor