The Tzu Chiang train, also spelled "Tze-Chiang" or "Ziqiang", or the "Tzu Chiang Limited Express" (Chinese: 自強號; pinyin: Zìqiáng Hào; Wade–Giles: Tzu4-ch'iang2 Hao4) is a type of express train service operated by the Taiwan Railways Administration (TRA) in Taiwan. Of the 5 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 push–pull train, the EMU1200 (electric multiple unit), EMU300 (also an EMU), TEMU1000 (Taroko Express), DR2800 (diesel multiple unit), DR3100 (also a DMU), 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.
The Tze-Chiang Limited Express is the Taiwan Railway Administration's highest class of deluxe express passenger train, and is also the class of service with the highest ticket price per mile.
The Tzu-Chiang Limited Express was so-named from a phrase in an address that Chiang Kai-shek, the former President of Republic of China (Taiwan), delivered to his countrymen on 26 October 1971 in response to United Nations Resolution 2758, in which he urged the country to "Respect the Homeland, Strengthen Self ("Tzu-Chiang"); Respond to Change without Fear." U.N. Resolution 2758 formally recognized Beijing as the government of "China" and de-recognized Taipei, at the same time revoking Taipei's U.N. membership. For this reason, the Tzu-Chiang is also sometimes referred to as the "Self-Strengthening Express".