Fodor's Expert Review Le Petit Train Jaune
The "little yellow train" has a service that runs from Bourg-Madame and La Tour de Querol, both easy hikes over the border into France from Puigcerdà (Bourg-Madame is the closest). The border at La Tour, a pretty hour-long hike from Puigcerdà, is marked by a stone painted with the Spanish and French flags. The train can also be picked up in Villefranche. The carrilet (narrow-gauge railway) is the last in the Pyrenees and is used for tours as well as transportation; it winds slowly through La Cerdanya to the medieval walled town of Villefranche de Conflent. The 63-km (39-mile) tour can take most of the day, especially if you stop to browse in Mont Louis or Villefranche. The last section, between La Cabanasse and Villefranche, is the most picturesque. In low season the trains are infrequent and subject to change.