service centers; electronic versions can be purchased through the website or through the mobile applications. The Coaster previously utilized the aforementioned contactless "Compass Card", made possible by Cubic Transportation Systems, Inc. The "Compass Card" allowed passengers from MTS and NCTD to store regional transit passes and cash value on a rewritable RFID card. Customers would have purchased passes and added cash value on the Internet or at any ticket vending machine. Prior to boarding a train, customers tapped their Compass Cards on the ticket validator located on the train platform. The LED display on the validator would then light up with lights resembling that of a stoplight, and the LCD display showed text regarding the passenger's fare account. The new Pronto system now used expanded upon many of the design concepts previously employed with the Compass Card system. Ridership The Coaster carried about 514,450 passengers during its first year of operation, and ridership rose steadily in the years that followed. In 2019, Coaster ridership was approximately 1.4 million people, with an average number of 4,200 weekday boardings. Approximately 40% of weekday commuters detrain at Sorrento Valley. Rolling stock In June 2018, the North County Transit District (NCTD) Board approved the purchase of five Siemens SC-44 Charger locomotives to replace their existing five F40PHM-2C locomotives that were remanufactured by Morrison-Knudsen, with $10.5 million of the estimated $53.9 million cost earmarked from statewide gas tax and vehicle registration fees. In June 2019, the NCTD Board approved the purchase of two additional SC-44 locomotives to replace two EMD F59PHI locomotives; they are due for delivery in late 2022. In September 2020, the NCTD Board approved the purchase of two more SC-44 Chargers, for a total of nine; planned for delivery in April 2023, they will be used to expand service. Deliveries of the first five Siemens SC-44 Charger locomotives took place from August–October 2020; they began revenue service on February 8, 2021, the same day Coaster retired their five F40PHM-2C locomotives. Two locomotives were donated; 2103 to the Pacific Southwest Railway Museum, and 2105 to the Southern California Railway Museum. In January 2020, Bombardier began to overhaul the legacy BiLevel equipment at a minimum rate of four cars per year; all 28 cars are planned to be overhauled and repainted into the new COASTER livery by 2026. The coach overhaul improvements include upgraded door systems, installation of LED light fixtures, seat cushion replacements,