The 2 f gauge of the track is unusual . It was shared by only three other public railways in the United Kingdom : the nearby Corris Railway ( which predated the Talyllyn ) , and the subsequent Plynlimon and Hafan Tramway and Campbeltown and Machrihanish Light Railway . The 2 f gauge of the track is unusual , and was shared by only three other public railways in the United Kingdom : the nearby Corris Railway ( which predated the Talyllyn ) , and the subsequent Plynlimon and Hafan Tramway and Campbeltown and Machrihanish Light Railway .