SRT awarded CNR a contract in October 2014 to supply 115 of the stainless steel-bodied coaches, including nine first-class and 88 second-class sleeping cars, nine restaurant cars, and nine generator cars.

The vehicles are equipped with air-conditioning and retention toilets, while some of the sleeping vehicles are fitted with lifting platforms to improve access for passengers with disabilities.

The new coaches are due to make their passenger debut on the Bangkok - Chiang Mai route in November and the fleet will replace life-expired rolling stock on services from Bangkok to Ubon Ratchathani, Nong Khai, and Butterworth (Malaysia) next year.