Let's imagine that you have a toy train set. And imagine that you want to take your toy train from one place to another, but there are obstacles on the way. In such cases, you might build a bridge or a tunnel, right?
Similarly, a long time ago, people used wagons to transport heavy things like coal, which was essential for heating homes and powering machines. But, there were obstacles too. There were hills and rocky areas, which made it hard to transport wagons. So, people came up with a solution - they built a special road for wagons that would make it easier to transport heavy goods.
This special road was called a "waggonway" and it was built on Holy Island, which is a small island in England. The waggonway ran from the coal mines on the island to the coast, where the coal could be shipped to other places. The waggonway was made of wooden tracks, which made it easier for the wagons to roll over the ups and downs of the hills.
The workers who built the waggonway had to cut trees and make wooden tracks, which took a lot of hard work. But, once the waggonway was built, it made transporting coal much easier and faster. This helped the people on the island to make more money by selling coal to other places.
So, in summary, the Holy Island waggonway was a special road made of wooden tracks that made it easier to transport heavy goods like coal. It was built a long time ago, and it helped the people on the island to make more money by selling coal to other places.