How to write the username format of Railway 12306

Railway 12306 Username Format: Length: 6-20 characters Content: Numbers, letters or underscores First letter: Lowercase letters or numbers Cannot contain special characters Cannot be the same as other users Username

Railway 12306 Username Format

Railway 12306 username must conform to the following format:

• Length: 6-20 characters
• Content: must be composed of numbers, letters or underscores
• Initial letter: must be lowercase letters or numbers
• Other characters: cannot contain special characters ( Such as: spaces, punctuation marks)
• cannot be repeated: cannot be the same as the user name of other users

Example:

• Correct: abc123, user_name, 123456
• Error: abc 123, user name, ~123456

## Notes when filling in user name:

It is recommended to use letters or a combination of numbers, avoid using usernames with only numbers or letters to enhance security.
• Avoid using personal information (such as name, ID number) as username to protect privacy.
• When filling in the user name, please note that it is case-sensitive. The system distinguishes between upper and lower case of English letters.
• Once filled in, the username cannot be easily changed, so please think carefully and choose a username that you remember.

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