The term 'TRACK PIECE' refers to two components of a railroad track: the RAIL and the crosstie. The RAIL is a metal bar that runs along the length of the track, providing a guide for the train's wheels. The crosstie is a wooden or concrete block that is placed between the rails to provide support and stability. Together, the RAIL and crosstie form the track piece, which is essential for the safe operation of a railroad.