Railway couplers are mechanical devices used to connect railway cars together, allowing them to move as a single unit. They ensure that the cars remain securely linked while trains are in motion, which is essential for safety and efficiency. Different types of couplers exist, including the Janney coupler and the Screw coupler, each designed for specific operational needs. These couplers also facilitate the easy attachment and detachment of cars during loading and unloading processes. They are typically designed to withstand heavy loads and harsh conditions, making them a crucial component in the operation of freight and passenger trains.