Working with NX, Railway and CI/CD` Deploying an NX monorepo on Railway using GitHub Actions involves setting up a workflow that triggers deployments for affected projects whenever code changes are pushed to the main or dev branches. The process starts by adding the repository containing the sample project to a Railway project, configuring the NX app name, disabling the GitHub trigger, and creating separate environments for the main and dev branches. Next, project tokens are created and added as repository secrets on GitHub, which are used in the workflow to authenticate with Railway. A GitHub Actions workflow is set up to run on every commit to the main and dev branches, testing if a particular project has been affected and deploying it to the correct environment on Railway if necessary. The workflow uses the `pnpm nx` command to determine which projects have been affected and then triggers a deployment using the Railway CLI. The process also involves dumping access secrets into a file in JSON format for security reasons.