The main tachyons repo is a collection of encapsulated css modules available on npm and github. You can grab the entire toolkit, or a few selected modules. Mix and match them to suit your project’s needs. Since tachyons modules are very focused on doing one thing well, most of them are extremely small (well under a kilobyte) so you can start using some or all of them without adding bloat to your css.
npm install --save-dev tachyons-module-name