QINGDAO -- Qingdao's enterprises have presented great resilience and vitality in boosting the country's foreign trade, and made key contributions to the country's foreign business in the first quarter.

Earlier this year, a core production enterprise under the China Railway Rolling Stock Corporation (CRRC) Corporation based in the city, Qingdao Sifang, signed a supply contract with Etihad Railway in the United Arab Emirates, which develops and operates UAE's national railway network, agreeing to provide high-speed bullet train units and a 15-year warranty for all related products, which marks the first time that China's passenger diesel multiple units have been exported to the UAE, which will help the latter establish trunk railway passenger transport services for the first time.

Officials from the company's market department said that the deal will further boost their sales in the whole gulf area.

The group also innovated its production system and made customized export trains to explore new markets overseas based on their different climatic conditions such as dusty weathers and extremely low temperature.