What trains do the train codes on the train timetable: X, Y, S, N refer to?

, "N" (inside) is an intra-rail express train (this train only runs within one railway bureau).

"Y" (Your) is a tourist train that runs between big cities and tourist cities.

"S" (Shenzhen) is the passenger express train operated by Guangzhou-Shenzhen Railway Company.

There is no N train.

Bus body

1. Type 18

Type 18 bus was designed and trial-produced in the 1960s. The external outline size and structure of the car body are basically the same as those of the China Railway Type 22 passenger car. It adopts UD2/UD3 (standard gauge)/UD4 (wide gauge) bogies and has a construction speed of 120km/h~140km/h. Equipped with self-generated air conditioning unit.

2. Type 19

The Type 19 bus is the size of an A-type bus for international transport, with a body length of 23.6 meters. The external outline dimensions and structure of the car body are basically the same as those of the China Railway Type 22 bus. . The Type 19 passenger car is a special model used for international passenger trains in China, Mongolia, and the Soviet Union. The production volume is not large.