The Tze-Chiang Express, also spelled "Tzu-chiang" or "Ziqiang" (Chinese: 自強; pinyin: Zìqiáng) is a type of express train service operated by the Taiwan Railways Administration (TRA) in Taiwan. Of the five service classes operated by the TRA, the Tze-Chiang trains is the fastest category. Ticketing is done on the basis of mileage (NT$2.27 per km with a 10 km minimum fee). This service is operated with 7 different trainsets: the E1000 series, the EMU1200 (electric multiple unit), EMU300, TEMU1000 (Taroko Express), DR2800 (diesel multiple unit), DR3100, and the TEMU2000 (Puyuma Express). The now-retired EMU100 was the first trainset built for this service, which was used for 30 years, terminating ordinary runs at June 15, 2009.