China Railway Siyuan Survey and Design Group
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China Railway Siyuan Survey and Design Group Co., Ltd. (Chinese: 中铁第四勘察设计院集团有限公司), referred to as Tiesiyuan (Chinese: 铁四院) or Siyuan (Chinese: 四院), is a Chinese engineering survey and design enterprises, under the China Railway Construction Corporation, headquartered in Wuhan, Hubei Province.
In 2011, its annual revenues from engineering survey and design service reached 2.989 billion yuan, the enterprise ranked in the second place for engineering survey and design in China in terms of annual revenues.