Cubes On The Cuyahoga. The Flats Industrial Railroad is a Class III railroad in the heart of Cleveland, Ohio. The line went through a long history of Class I operation with railroads, with successor ownership from Baltimore & Ohio and Conrail until 1996 when the FIR was created. The line is so named for serving customers in the Flats area of Cleveland. Since the summer of 2020, the line has been idle, leaving an uncertain future. On the night of Wednesday, February 3, 2021, FIR 1202 (SW1200) and 1222 (SW1500) sit by the lift bridge that leads to their interchange partner, Norfolk Southern.