This is the train set used by the British Royal Engineers in the first year of the First World War.
It was the largest of the three train sets used in the Battle of the Somme and was the first to arrive at the front.
The other two were used for the Battle Of The Somme in 1916 and the Battle At Ypres in May 1915.
It has since become a museum piece and sold for £25 million ($35 million) in 2017.
A third train set was used to move the first troops across France to the Battle for Alsace-Lorraine in June 1915.
The first two train sets were destroyed by the Germans and the third train was destroyed by Allied bombs during the Battle at Stalingrad.
The train set is thought to have been lost to the Allies after the war.
[Source: The Telegraph] The train sets and other equipment from the First and Second World Wars are in museums around the world.