Which mode of transport is noted for being very fuel efficient?

Rail transport is noted for being very fuel efficient primarily due to its ability to move large quantities of goods over long distances while consuming relatively low amounts of fuel compared to other modes. The efficiency of rail transport comes from several factors.

First, trains have a high carrying capacity, allowing them to transport a large volume of freight in a single trip. This capacity means that the fuel cost per ton-mile is significantly reduced, as the same amount of fuel can move many tons of goods simultaneously. Additionally, the design of trains, which can leverage gravity on downhill slopes and maintain momentum, also contributes to their overall efficiency.

Another aspect of rail transport's fuel efficiency is related to the infrastructure: trains run on dedicated tracks which allow for smoother and often faster travel with fewer stops and starts compared to road transport. This is a contrast to motor carriers, which typically have more frequent stop-and-go scenarios, increasing fuel consumption.

Lastly, rail transport’s emissions per ton-mile are typically much lower than those from trucks or air transport, further showcasing its environmental benefits. Therefore, when considering fuel efficiency in the context of transportation modes, rail transport stands out as the most effective option.