A train coupler is a complex locking mechanism designed to securely connect train cars, but under certain conditions, it can get stuck, causing operational delays. As shown in the image, the coupler relies on an interlocking latch system with rotating components and spring-loaded mechanisms to engage and disengage properly. However, misalignment during coupling, excessive force, debris accumulation, or weakened springs can prevent smooth operation, leading to a jammed coupler. Additionally, extr