In celebration of the physical release of New Super Luigi U on August 25th, Nintendo held an event in Chicago on August 12th where one of the trains had been designed with New Super Luigi U imagery on the inside and outside. In a tweet released by Nintendo of America's official twitter account, this picture was posted along with the following message:
"Hey, it's the Chicago River. I hear sometimes they dye it green. I guess they forgot today ... pic.twitter.com/ddOZpbRf4u"