<p>Straddle-type monorail trains have been widely used in airports, scenic spots, and various transport hubs in recent years, owing to the advantages of their compact design, exceptional ability to pass small radius curves, a short construction period, and good noise reduction and vibration reduction of rubber wheels. Nevertheless, challenges such as the crosswind loads and uneven track surfaces can undermine their running stability, adversely affecting passenger comfort. To improve the running stability of straddle-type monorail trains and improve the passenger experience, a photovoltaic energy-supplying magnetorheological (MR) damping system for straddle-type monorail trains based on MR fluid is proposed in this paper. The whole damping system is powered by solar energy, and the grouping cycle algorithm is used to choose corresponding currents according to different displacements of the controlled structure; then, the vibration reduction device is controlled to generate the corresponding damping force. In this paper, the test system is built, and an experiment on the current control effect of the MR damping system under three different frequencies and sinusoidal displacement with an amplitude of −20 to 20&#xa0;mm is carried out. The results indicate that the output force of the magnetorheological damper (MRD) changes correspondingly with the displacement, and the measured-to-theoretical current discrepancy remains within 4% tolerance, which exhibits good following performance. So the damping system can adaptively adjust the damping force according to different vibration conditions during train operation and improve the running stability of straddle monorail trains.</p>