The newest series of railcars, which replaced the 2200-series and 2400-series cars, is the 5000-series (numbered 5001–5714). The cars were built by Bombardier of Plattsburgh, New York. The CTA received ten prototype cars in 2009, which underwent testing, and began operating in 2011. The order is for 406 cars, with options for another 308 cars. The Chicago Transit Authority planned to put the first ten cars into in-service testing in mid-April 2010. The first in-service test run was made on April 19.