Buffer and chain couplers are devices used in railway systems to connect train cars. The buffer acts as a shock absorber, reducing the impact when cars come together, while the chain coupler links the cars securely. This combination ensures smooth movement and safety during travel. These couplers are essential for maintaining the integrity of the train's structure. The buffer absorbs forces from acceleration and braking, while the chain coupler allows for flexibility in the train's length. Together, they enhance the overall performance and reliability of the railway system, contributing to efficient transportation.