Russia's armored trains are a valuable tool with some big vulnerabilities

• Russia has used armored trains for military purposes for more than a century.
• Trains are useful for moving large amounts of supplies or equipment over long distances on land.
• Trains also use fixed routes, leaving them exposed to attack by artillery, missiles, and aircraft.

Russia's two-year war on Ukraine has demonstrated how antiquated warfare and tactical concepts can still have a place alongside cutting-edge technology on a modern battlefield.