Question: Who governs the size classification of Caldwell County Railroad?

full_context: Document 1: R.J. Corman Railroad Group: R.J. Corman Railroad Group, LLC is a privately owned railroad services and short line operating company headquartered in Nicholasville, KY, with field locations in 23 states. It was owned by Richard J. Corman, who established the company in 1973, and ran it until his death on August 23, 2013. The company owns eleven short-line railroads spanning Indiana, Kentucky, Mississippi, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Texas, and West Virginia. The company serves all seven Class I railroads, many regional and short line railroads as well as various rail-served industries. These operations encompass an array of services, including: railroad construction, short line railroad operations, dispatch, industrial switching services, emergency response, track material logistics, distribution centers, signal design and construction, building eco-friendly locomotives, railroad worker training and an excursion dinner train.
Document 2: St. Louis Southwestern Railway: The St. Louis Southwestern Railway (reporting mark SSW) , known by its nickname of "The Cotton Belt Route" or simply Cotton Belt, is a former US Class I railroad which operated between St. Louis, Missouri, and various points in the states of Arkansas and Texas from 1891 to 1992.
Document 3: Railroad classes: In the United States, railroads are designated as Class I, II, or III, according to size criteria first established by the Interstate Commerce Commission (ICC) in 1911, and now governed by the Surface Transportation Board.
Document 4: Rockton and Rion Railway: The Rockton and Rion Railway was a Class III railroad operating freight service in Fairfield County, South Carolina until its abandonment in 1981. The railroad's entire 12-mile right-of-way is now owned by the South Carolina Railroad Museum, which rebuilt some of the railroad and currently operates on 5 miles of the line.
Document 5: Corinth and Counce Railroad: The Corinth and Counce Railroad was a Class III railroad operating freight service between Mississippi and Tennessee. The line was built in 1959, expanded in 1974 and sold in 1991 to a new owner who changed the railroad's name. Today, some of the Corinth and Counce's trackage is operated by the Kansas City Southern Railway.
Document 6: Standard gauge: The standard gauge (also Stephenson gauge named after George Stephenson, International gauge, or normal gauge) is a widely used railway track gauge. Approximately 55% of the lines in the world use this gauge. All high-speed rail lines, except those in Russia, Uzbekistan, Finland and Australia, utilize standard gauge. The distance between the inside edges of the rails is defined to be 1435 mm except in the United States, where it is still defined in Imperial and US customary units as approximately 4 ft 8½ in. It is also called the UIC gauge or UIC track gauge, the European gauge in the EU and Russia, or uniform gauge in Queensland, Australia.u
Document 7: Shenandoah Valley Railroad (short-line): The Shenandoah Valley Railroad (reporting mark SV) is a shortline railroad operating 20.2 miles of track between Staunton and Pleasant Valley, Virginia. The railroad interchanges with CSX and Buckingham Branch in Staunton and Norfolk Southern in Pleasant Valley. The railroad was purchased from Norfolk Southern in 1993 and is currently operated by the Durbin and Greenbrier Valley Railroad.
Document 8: Railroad Labor Board: The Railroad Labor Board (RLB) was an institution established in the United States of America by the Transportation Act of 1920. This nine-member panel was designed as means of settling wage disputes between railway companies and their employees. The Railroad Labor Board's approval of wage reductions for railroad shopmen was instrumental in triggering the Great Railroad Strike of 1922. The Board was terminated on May 20, 1926 when President Calvin Coolidge signed a new Railway Labor Act into law.
Document 9: Carolina and Northwestern Railway: The Carolina & Northwestern Railway (Ca&NW) was a railroad that served South Carolina and North Carolina from 1897 until January 1, 1974. The original line was operated by the Ca&NW as a separate railroad controlled by the Southern Railway until 1974 when the name was changed to the Norfolk Southern Railway. On June 1, 1982, Southern Railway and Norfolk and Western Railroad merged to form Norfolk Southern Railway. Choosing to use the name 'Norfolk Southern Railway' for the merger, in 1981, the original Ca&NW line along with original Norfolk Southern Railway was renamed Carolina and Northwestern once again. In the early 1950s several shortline subsidiaries of the Southern Railway were leased to the Ca&NW for operation, with these lines remaining a part of the Ca&NW into the 1980s.
Document 10: Caldwell County Railroad: The Caldwell County Railroad (reporting mark CWCY) is a Class III shortline railroad operating over 17 mi between Hickory and Lenoir, North Carolina. The CWCY is operated by Southeast Shortlines, Inc., which also operates the Thermal Belt Railway.
Document 11: C&amp;NC Railroad: The C&NC Railroad, also known as the Connersville and New Castle Railroad (reporting mark CNUR) , is a Class III short-line railroad that connects the towns of Beesons and New Castle in eastern Indiana. Beginning from an interchange with the Big 4 Terminal Railroad line in Beesons, it runs north through Fayette County, then through the Wayne County communities of Milton and Cambridge City, then northwest into Henry County through New Lisbon to New Castle, where it joins a Norfolk Southern line. The total length of the line is 27.62 mi .
Document 12: Conrail: Conrail, the Consolidated Rail Corporation, (reporting mark CR) , was the primary Class I railroad in the Northeastern United States between 1976 and 1999, when its routes were split between the CSX Corporation and Norfolk Southern Railway. Conrail, a portmanteau of "consolidated" and "rail" from the name of the company, operates now as a joint-subsidiary for some limited functions.
Document 13: High-speed rail in the United States: Plans for high-speed rail in the United States date back to the High Speed Ground Transportation Act of 1965. Various state and federal proposals have followed. Despite being one of the world's first countries to get high-speed trains (the Metroliner service in 1969), it failed to spread. Definitions of what constitutes high-speed rail vary, including a range of speeds over 110 miles per hour and dedicated rail lines. Inter-city rail in the United States with top speeds of 90 mph or more but below 125 mph is sometimes referred to as higher-speed rail. The Acela Express (reaching 150 mph) and the Northeast Regional (reaching 125 mph) are currently the only services in the country (the Metroliner was discontinued in 2006).
Document 14: Amtrak: The National Railroad Passenger Corporation, doing business as Amtrak , is a passenger railroad service that provides medium- and long-distance intercity service in the contiguous United States. Founded in 1971 to take over most of the remaining U.S. passenger rail services, it is partially government funded yet operated and managed as a for-profit corporation.
Document 15: Kansas City Southern Railway: The Kansas City Southern Railway Company (reporting mark KCS) , owned by Kansas City Southern, is the smallest and third-oldest Class I railroad in North America (just behind Union Pacific Railroad and Canadian Pacific Railway) still in operation. Founded in 1887, KCS currently operates in 10 central U.S. states. KCS also owns and indirectly operates Kansas City Southern de México (KCSM) in the central and northeastern states of Mexico, and is the only Class I Railroad to own any track both inside and outside of Mexico's boundaries (Ferromex is the only other Class I operating in Mexico). KCS owns about 9,600 kilometers (6,000 route miles) of track, including trackage owned by subsidiaries.
ground_truth: Surface Transportation Board