Why does the train ticket start with y?

Trains starting with Y are tourist trains. For passenger trains that run between stations with historical sites, tourist resorts and large and medium-sized cities, temporary tourist trains are faster, have fewer stops and are more advanced. The speed is more than 160 kilometers per hour. Trains set up for tourism are divided into direct tourist trains and intra-tour tourist trains.

The trains prefixed with Y are special tourist trains that pick up tourists at fixed points and go directly to their tourist destinations. Different car bodies are equipped according to the requirements and levels of travel agencies.

Other types of vehicles:

High-speed EMU trains (prefix G), intercity EMU trains (prefix C), ordinary EMU trains (prefix D), direct Express passenger trains (prefix Z), express passenger trains (prefix T), fast passenger trains (prefix K)

Inter-bureau ordinary passenger express trains (1001-2998), intra-bureau ordinary passenger express trains (1001 -2998), temporary passenger trains (prefix L), temporary tourist trains (prefix Y), ordinary passenger trains (6001-7598).

Reference for the above content: Baidu Encyclopedia - Temporary Tourist Train