The Influence of Different Marshalling Methods on 30,000-Ton Heavy Haul Trains

To study the reasonable formation mode of the 30,000-ton heavy-duty train, the article establishes a longitudinal dynamics model of the 30,000-ton heavy-duty train to study the transfer characteristics of the train air braking system; on this basis, two typical operating routes are selected, and the longitudinal impulses under the cyclic braking condition of the train of two different formation modes are analyzed by simulation. The results show that: the train is in consistent type downgrade and regenerative conditions, the location of the maximum hook force changes when the tail locomotive is put in and excised, and the power braking is put in, which helps to improve the train pressure hook force. When the train is passing through a sizeable undulating ramp, the regenerative condition, with power brake input, helps to improve the train pressure hook force when passing through a concave ramp. Power brake removal helps to strengthen the train pulling hook force when the train passes the convex ramp. The longitudinal impulses of the two formations are kept at a low level under each line condition, which provides a reference for the subsequent 30,000-ton heavy-duty train test and the formation selection for normalized operation.