Abstract: A shipboard transportation simulator to simulate rolling motion of a ship transporting ammunition in commercial containers. The cargo containers are mounted above the roll axis and adjustable counterweights are positioned below the axis. A Scotch-yoke structure converts a motor rotary drive to a longitudinal drive to rock the container and counterweights about a roll axis. A platform can also be attached to the Shipboard Transportation Simulator for testing restraint systems for break bulk cargo. The simulator operates continuously over long periods of time to produce the effects of fatigue, the compression of wood fibers, and the stresses on fasteners that tend to cause failures at sea. It is very useful in quickly developing restraining systems that are adequate for the job at the least cost. Provision is made for different rolling angles, different loads, and variable speeds.