With the first train at 6:42 am, and then around one every hour until 8:42 pm, you can get to Troyes in about 90 minutes from Paris Gare de l'Est (€15–€20.50). Sens to Troyes is a little harder; there are seven daily trains, but they involve changing in Paris, Laroche Migennes, or Saint Florentin Vergigny. The journey takes just over three hours and costs €19.60–€31.60. Within Troyes, public transit is provided by TCAT buses (wwww.tcat.fr); single tickets cost €1.35.
Troyes Tourist Office. 16 rue Aristide Briand, Troyes, 10000. 08–92–22–46–09; www.tourisme-troyes.com.