A little train named Denis decided to go through one turn repetitively, speeding up till he derails. The radius of the turn is R=190m, tilt of the rail is α=5◦, the rail width is d=1.4m and the center of the mass of the train is h=1.6m from the rails. What's the difference between minimal and maximal speed with which the train could go through the turn without derailing. The result should be in kilometres per hour. The gravitational acceleration is g =9.81m·s−2. The train moves horizontally.