An armoured train is a railway train protected with armour. They are usually equipped with railroad cars armed with artillery and machine guns. They were mostly used during the late 19th and early 20th century, when they offered an innovative way to quickly move large amounts of firepower. Their use was discontinued in most countries when road vehicles became much more powerful and offered more flexibility, and because armoured trains were too vulnerable to track sabotage as well as attacks from the air. However, the Russian Federation used improvised armored trains in the Second Chechen War in the late 1990s and 2000s.