The Echigo TOKImeki Railway Company (ETR) is a Japanese third-sector railway operating company established in 2010 to operate passenger railway services on the sections of the JR East Shinetsu Main Line and JR West Hokuriku Main Line within Niigata Prefecture when they were separated from the respective JR Group operators in March 2015, coinciding with the opening of the Hokuriku Shinkansen extension from Nagano to Kanazawa. The main shareholders of the company are Niigata Prefecture, the city of Joetsu, the city of Itoigawa, and the city of Myoko.

The Shinetsu Main Line is a railway line, consisting of three geographically separated sections, operated by the East Japan Railway Company in Japan. It was originally one continuous line connecting Takasaki and Niigata via Nagano. Since the opening and later extension of the Hokuriku Shinkansen, sections running in parallel have either been discontinued or transferred to third-sector railway companies.