Letter meaning of train number

There are different English letters in front of different trains, so what do the letters in front of the trains mean? Trains starting with 1 and g represent high-speed emus, and the speed can generally reach 350 kilometers per hour. The beginning of k means express bus. The running speed is generally low, with the speed of 120km/h..3.Z beginning with a direct express passenger train, and the speed of160km/h.4.t beginning with an express passenger train with the speed of140km/h.5. The letter "c" stands for intercity emu. 6. The word "Y" at the beginning means a special tourist train, which generally runs between tourist attractions or large and medium-sized cities. 7.L begins with a temporary passenger train, which is relatively rare. Generally, it will be added during the peak passenger flow. 8. The D word starts with the EMU passenger train, and the train speed is generally more than 200 kilometers per hour.