The story
A formal request for the licensing of a rail network was made by the mayor of Locarno, Francesco Balli, in 1898, but although construction of the Centovalli Railway was begun in May 1913, the collapse of the financing bank later that year, together with the intervention of the First World War meant that construction was not resumed until August 1921, with the line being constructed from each end and meeting on 27 March 1923 and public service being inaugurated on 25 November 1923. On 12 November 1918 Italy and Switzerland had signed a contract about the construction of a narrow gauge railway, Locarno - Domodossola. This contract fixed the cross acceptance of Italian vehicles in Switzerland and vice versa without needing a second approval.
From Wikipedia’s article on Regional Bus and Rail Company of Ticino, shared under CC BY-SA 4.0.4