I found this on goggle Joe. I also found a you tube video showing hoppers pulled by CSX, In the video the cars had a large SR at one end. Paul
The Somerset Railroad (reporting mark SOM) is a shortline railroad that operates in Niagara County, New York. The railroad was built with the primary objective of providing coal to the Kintigh Generating Station, a 675 megawatt coal-fired power plant located in Somerset, New York. The railroad was built in 1983 by the New York State Electric and Gas Co. using new and old rights of way. From Lockport, New York, it runs on the defunct International Railway Co. (IRC) interurban (intercity trolley) line opened in 1900 under the name Buffalo, Lockport & Olcott Beach (BL&OB) which became part of the IRC in 1902. From Newfane, New York, the SOM sweeps off the IRC (abandoned in 1937) to the Hojack Line in Appleton, New York (Township of Newfane, Niagara County, NY), to West Somerset in the Town of Somerset. It then swings off on new trackage to a series of spurs and a loop at the Kintigh Generating Station.
Although the Somerset Railroad owns 428 rotary-dump gondola cars, CSX provides their motive power and operates the railroad. Prior to the acquisition of Conrail by Norfolk Southern and CSX in 1998, Conrail provided motive power. The Somerset Railroad right of way includes 15.59 miles (25 km) of trackage, known as the Somerset Secondary. Unit coal trains leaving from Youngstown, Ohio, run to Erie, Pennsylvania, followed by Buffalo, then north to the Niagara Branch, where they swing off onto the Lockport Subdivision, and finally in Lockport onto the Somerset Secondary.
The coal cars are unloaded using a rotary car dumper at the power plant. Also on the line in Lockport is a chemical plant, Vanchlor, which receives anhydrous ammonia via the railroad. The first train on the line ran in November 1983. Power was provided by four Conrail GE B23-7s. The lead unit's number was #1926.