What role did trains/railways play in the war effort of both sides in WWI?

WWI hospital train
After British train smash on the border of Scotland and England

During WWI Russia used light and heavy armored trains. The light trains contained 76mm guns. Austria-Hungary used armored trains against the Italians. Before the war, Germans invested heavily in trains. Sometimes trains were called " iron horses." Before WWI trained were used by farmers to move their Harvest to a market. One of the problems with these " war trains" was that they tipped over very easily. Trains were sometimes used to bring food and ammunition to the men on the front lines.

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