the ends of the exterior and interior of the train, displaying the terminus station on exterior signs, with interior displays showing next station, terminus station, and system announcement information. The first Mark III vehicles of the initial 28-car order entered service on August 18, 2016, on the Expo Line. They were temporarily pulled from service pending further testing on September 26, 2016, when one of the trainsets lost power while crossing the Skybridge a few days earlier. An additional 28 cars were ordered later that year and arrived beginning in 2018; that second 28-car order was later expanded to 56 cars in early 2018, all of which were delivered by 2019 as part of the 10-year vision plan, bringing the total of Mark III cars in service to 84. In November 2021, it was revealed that TransLink was reserving the Mark IV designation in the event it upgraded select Mark III trains in the future. Alstom Mark V In December 2020, TransLink announced the purchase of 205 SkyTrain cars from Bombardier at a cost of approximately $722million. These trains are designated to replace the first-generation Mark I trains, to expand the fleet for the Broadway extension, and to improve capacity on the Expo and Millennium Lines. They will be formed as 41 five-car trains, a first on the SkyTrain network, as all trains up to this point currently have operated in two-, four-, or six-car configurations. There will be several improvements in contrast to the Mark III trains such as passenger WiFi, a new seating layout, bike racks, and an overall increase in reliability. In November 2021, it was revealed that the new trains would be designated as Mark V vehicles, with the Mark IV designation reserved for current Mark III cars which will receive minor upgrades. These would be the first SkyTrain vehicles made by French manufacturer Alstom after their acquisition of Bombardier Transportation in January 2021. It was also at this time that a mockup was sent to TransLink to aid in the design phase. The first train is expected to arrive in October 2023 for testing, and one train is scheduled to arrive per month between June 2024 and September 2027. The order contains an option for the purchase of up to 400 additional cars to support future fleet expansion, replacement, and system extension projects. Assembly for the first cars began in June 2022 at Alstom's Quebec