Cleburne is a city southwest of Fort Worth, in Texas and the site of the Santa Fe shops that rebuilt F units into CF-7's.
Claiborne, is Camp Claiborne, a World War 2 Army camp which was one of the largest training camps in the US. Original home to the 82nd and 101st Airborne divisions, and the Claiborne and Polk (Camp Claiborne to Camp Polk, now Fort Polk) Military Railroad that trained military railroaders who worked all over the world during WW2.
TSR #300 was used on the C&PMRR (locally known by the troops as the 'Crime and Punishment')as USA #20 before going to the Tremont and Gulf as#28 after the war and eventually winding up at TSR after further service as Southern Pine Lumber #28.