La Chaux-de-Fonds railway station
The station also offers interchange with two metre gauge lines: the Chemins de fer du Jura ( CJ ) line to Saignelégier and the Transports Régionaux Neuchâtelois ( TRN ) line to Les Ponts-de-Martel . 
<triplet> Chemins de fer du Jura <subj> metre gauge <obj> track gauge <triplet> line to Saignelégier <subj> Chemins de fer du Jura <obj> operator <triplet> line to Les Ponts-de-Martel <subj> metre gauge <obj> track gauge