H-series cars. 48 cars based on the H1 model were built and used for the Expo Express in Montreal, for Expo 67. 108 modified H6 cars were produced for the Ankara Metro by Bombardier from 1996 to 1997. Retirement and future The H1 and H2 cars were replaced by the T1-class cars. The last 12 remaining H1 cars were retired on November 29, 1999. All of the H2 cars were retired by September 28, 2001. Nearly all H1 and H2 cars were scrapped, although several H1 cars are used as subway work vehicles. Some H4 cars were retired when T1-series cars were delivered. In 2006, the TTC placed an order with Bombardier Transportation for the first 39 articulated Toronto Rocket (TR) trains to be operated on the Yonge–University-Spadina (YUS) line. This allowed the TTC to retire the remaining H4 and H5 cars. A contract option was exercised in 2010, when the TTC ordered 31 additional new TR trains making 70 trains in total. This allowed for the retirement of the H6 subway cars on the Bloor–Danforth line and to have enough new TR trains available for the opening of the YUS line extension to Vaughan. With the arrival of the articulated TR trains in 2011, many T1-series trains were transferred from the YUS line to the Bloor–Danforth line. This allowed for the retirement of the H4 cars, between the fall of 2011 until January 27, 2012, when the last H4 train made its last run during the morning rush on the Bloor-Danforth line. The H4s were expected to be scrapped at Future Enterprises in Hamilton, Ontario, although some H4 cars were retained for use as maintenance trains. The H5 trains were replaced shortly thereafter by the arrival of more TR-series trains. The last H5 train made its final service run on June 14, 2013, with a round-trip on the YUS line. That trip began at Wilson station en route to Finch station. On the return trip, the train encountered technical difficulties at Eglinton West station, meaning the train had to go out of service. While many H5 subway cars were scrapped, some cars were sent to the United States for refurbishing and were expected to be shipped to the Lagos Metropolitan Area Transport Authority of Nigeria for the Lagos Rail Mass Transit project. The H6s were the only version of the H series still in service when, on June 20,