It seems like your custom domain isn't resolving correctly after setting it up with Cloudflare. Here are a few steps to troubleshoot and resolve the issue:

1. DNS Records: Ensure that you have correctly set up the DNS records in Cloudflare. You should have a CNAME record pointing your domain to the Railway app's domain. Make sure the proxy status is set to "Proxied" (orange cloud).

2. Propagation: DNS changes can take some time to propagate. If you recently updated your DNS settings, it might take a few hours for the changes to reflect globally.

3. Cloudflare SSL Settings: Check your SSL/TLS settings in Cloudflare. Ensure that it's set to "Full" or "Full (strict)" to avoid SSL handshake issues.

4. Railway Configuration: Verify that your custom domain is correctly configured in Railway. You should see a green cloud indicating that Cloudflare proxy is detected.

For more detailed guidance, you can refer to the Public Networking guide on Railway's documentation.

If the issue persists, please double-check your DNS settings and let me know if you need further assistance.