Despite high initial expectations, the line didn't sustain anticipated traffic levels. With the rise of road traffic in the 1930s, the railway's relevance diminished, leading to the last train running in the autumn of 1937, only 42 years after the line's inauguration.
Today, the former railway route between Westport and Achill has been repurposed into an off-road cycling trail, encapsulating a fine array of engineering structures, gentle gradients, and breath-taking scenery—a fitting testament to the railway's glorious era.