Two different bus networks operated by regional transit agencies run during the overnight hours when BART is not operating. The All Nighter is a regional network providing basic overnight service to much of the Bay Area. Most BART stations are served (directly or within several blocks) by the All Nighter system except for the Antioch–Rockridge and Bay Fair–Dublin/Pleasanton segments plus Warm Springs/South Fremont station. A network of seven BART-specific routes operated by regional agencies run between 3:50 am and 5:30 am to replace early-morning weekday BART service during the Transbay Tube retrofit project. Two San Francisco/Peninsula routes and five Transbay routes run between a limited number of major BART stations, with the San Francisco/Peninsula and Transbay routes meeting at the Temporary Transbay Terminal. The original Early Bird Express network introduced on February 11, 2019 had fifteen routes. One East Bay-only route was discontinued on June 17, 2019, and another on December 16, 2019. Six routes were discontinued on April 27, 2020, with the remaining seven routes being cut to 1–2 trips each.