So you know how trains can take people and things from one place to another? Well, during a war, the army also needs to be able to move soldiers, supplies, and weapons quickly and easily.
That's where the war department light railways come in. They're a special kind of train system that was used by the British Army during World War I.
These trains were smaller and lighter than regular trains, so they could go to places where the big trains couldn't go, like narrow and winding paths. They also had stronger engines, so they could carry more weight, even over tough terrain.
The army used these trains to transport soldiers, weapons, ammunition, and supplies to the front lines where they were needed. They could quickly move troops and equipment to where they were needed the most.
Overall, the war department light railways were an important part of the war effort, helping the army transport goods and people quickly and easily, during a time when every second counted.