Nice little article about the use of armored trains during the world wars

http://www.businessinsider.com.au/armored-trains-of-world-wars-i-and-ii-2014-11/#this-early-polish-train-smialy-is-one-of-the-most-famous-of-the-era-the-rotating-turret-on-the-front-helped-clear-out-anything-that-got-in-the-way-1