Beginning February 11, 2019, BART will shift its start of service from 4am to 5am on weekdays to allow extra time for a critical seismic retrofit of the Transbay Tube. This change will last for the duration of the 3.5 year-long project. WestCAT is one of many Bay Area bus operators that will operate bus service for BART at the 4am hour for the duration of this project. The schedules, stops, and other critical details have now been finalized between the bus operators and BART. Please click on the following link for additional information about the Early Bird Express service.