The term TYPE OF RAIL can be solved by two different crossword solutions: COOT (4 letters) and EASER (5 letters). COOT stands for Concrete Open T-Beam, which is a type of rail used in railway construction. It is made of concrete and steel and is designed to provide a strong and durable track. EASER stands for Electric Arc Steel Rail, which is a type of rail used in high-speed railway systems. It is made of steel and is designed to provide a smooth and safe ride. Both types of rails are used in railway construction and provide a reliable and safe track for trains.