Deploying Ghost on Railway allows users to build and run blogs, magazines, and journals using an open-source publishing platform. The process involves clicking a button, entering environment variables, and hitting deploy, which automagically provisions a MySQL database and runs required database migrations. Environment variables such as Cloudinary URL and Mailgun SMTP login are optional but recommended for full functionality. Users can use pre-bundled themes or add custom themes by modifying the package.json file and pushing changes to Github. With Ghost on Railway, users can write and publish posts, invite teammates, set up a newsletter and subscriptions, and even attach a custom domain to their instance.