A railroad or railway is a direct means of land transport, designed to be used by trains, for transport both passenger and delivery. It consists of two parallel rails, generally made of strengthen, and timber or existing sleepers or ties that grasp the rails accurately at the correct distance from each other.
Rail transport is one of the most power efficient means of mechanized land transport known. The rail gives very smooth and hard surfaces on which the wheels of the train may roll with a minimum of friction. This is more relaxed and saves energy. Trains also have a small frontal area in next of kin to the load they are carrying, which cuts down on air resistance and thus energy usage. In all, under the right situation, a train needs 50-70% less energy to transport a given tonnage of freight (or given number of passengers), than by road. Furthermore, together with the sleepers the rails distribute the weight of the train evenly, allowing considerably greater loads per axle/wheel than in road transport.
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