SIYUAN is among the earliest design companies for studies on suburban railways. In early days, commissioned by National Development and Reform Commission, SIYUAN started to study on solutions for suburban rail transit development, and has completed numerous high-quality research projects on solutions for Suburban railway development, which have been well acknowledged by leading experts, making itself a frontrunner in this regard. At present, SIYUAN have undertaken many such projects in Wenzhou, Nanjing, Wuhan, etc., among which the construction of Wenzhou Line S1 has commenced.