Certified in Logistics, Transportation and Distribution (CLTD) Practice Test 2026 – Your All-in-One Resource to Complete Exam Success!

The type of train known specifically for transporting low-value commodities such as coal is a unit train. Unit trains are designed to carry a single type of commodity, often over long distances, and are operated in a way that maximizes the efficiency and speed of transport for that commodity.

These trains consist of many cars linked together, typically carrying bulk cargo like coal, grain, or other raw materials. The benefit of using a unit train for such low-value goods lies in the economies of scale, as it reduces costs associated with loading, unloading, and handling, thereby making it more economical for transporting large quantities of bulk goods.

In contrast, a freight train is a broader category that encompasses all types of goods transport, including various commodities and products, whereas passenger trains are dedicated to transporting people. High-speed trains are designed primarily for the fast movement of passengers rather than bulk goods, which makes them unsuitable for carrying low-value commodities like coal.