After buying the train ticket with your own money, the steps to write it off on Ctrip are as follows:

  1. Open Ctrip APP and log in to your Ctrip account.
  2. Enter the “My” page, find the “Order” or “Itinerary” option, and click to enter.
  3. Find the train ticket order you need to cancel in the order list, and click to enter the order details.
  4. On the order details page, find the “Write-off” or “Refund” option and click to enter.
  5. Follow the page prompts, enter your ID number and order information, and confirm the write-off.
  6. After the write-off is successful, you can check the write-off status in the “Refund Record” or “Order Record” on the “My” page.

Please note that the specific operation steps may change, please refer to the actual interface of Ctrip APP.