You can pay with credit card when purchasing train tickets at 12306.

The specific steps are as follows:

1. Log in to 12306 and select the train ticket you want to purchase.

2. After selecting the train ticket, click the "Online Payment" button.

3. Select the bank you are using on the page that opens, such as "China Merchants Bank" here.

4. You are paying by credit card, so select "Pay with Card Number and Password" and select "Credit Card".

5. Then enter your credit card number in the "Credit Card Number" and click the "Next" button after completing the input.

6. Next, you need to fill in the credit card authentication information and query password. After completion, click the "Confirm Payment" button to continue: Then the "Online Payment Transaction Confirmation" dialog box will pop up, click the "OK" button. Can.