Train with the production of locomotives in the head and part
Train with the production of locomotives in the head and part of a combined brake lines can have a mass of 6 thousand to 12 thousand tons with the number of axes in the 400-540 when finding a second engine at about the middle (usually a train formed by connecting two trains) or have a mass of 8 thousand to 16 thousand tons with the number of axes of 540-780 with coupling to the locomotive in the 25-35% of the total number of cars. These trains allow for treatment at sites with slopes up to 0,012. The criterion of maximum mass of such trains are the longitudinal forces that arise when emergency braking from a failed radio communications, and rapid discharge of the brake line is not controlled by an engineer (the gap or separation of brake hoses, etc.). The peculiarity of the maximum mass of trains is long (10-20 s) the action of dynamic longitudinal forces, which take into account in the stability of wagons on squeezing, especially on curves plots the path of small radius and the switches. Therefore, the trains weight of more than 12 tons of cars between locomotives shall have a minimum load of 50 tons
Maximum speed of repetition of such trains, determined by the efficiency automatic brakes should be reduced in comparison with fixed at 15 and 10 km / h, respectively, in finding the locomotives in the middle of the second and third of the train.
At the head locomotive and the tail carriage handle terminal crane should be additionally fixed to avoid inadvertently opening the terminal crane in transit.