Landquaker (The Great Iron War, Book 4)

The Resistance has barely nursed its wounds from the recapture of Blackout, and it is now looking to another, tougher target: the massive steam-powered railway gun known as the Landquaker. They call the vast railroad the Iron Wall, and that mounted barrel is its only sentry. It does not need another. Blackout was a sitting duck, but the Landquaker is a moving target, and not only one that shoots back, but one that shoots first. The Resistance turns to old allies and new friends, from the land-loving tribes to the land-roving biker gangs. It will need every soldier it can muster. The Landquaker was designed with a singular purpose: a monstrous gun to hold back a multitude of monsters. Except this time the multitude mans that weapon, and in its hands the land is not the only thing that will quake.