You can purchase a SunCard from the TVM, located at each station, using cash or all major credit cards located in each station. See image below.
It is important to register your SunCard at Rider Web for balance protection should the card be lost or stolen. If you are interested, please ask your employer about the availability of the Federal pre-tax assistance program. Daily one-way and round-trip tickets are available for purchase at TVMs or using the SunRail mobile app.