The trial lasts for 30 days or until you've used up the $5.00 of credits.

When your trial ends, you can choose to upgrade to a paid plan or downgrade to the Free plan at https://railway.com/workspace/plans.

My dashboard says clearly "12 days or $4.47 left", it is not showing 30 days and I started using your service just one or two days ago. !Why?

You created your account before you started using Railway’s services.

The trial starts when you create the account, not when you start using the platform.

No. I signed up and then create my first app at the same day. The system always showed 14 days remaining from the very beginning. Never showed up 30 days left.