Nancy

The city
Nancy is the standout overnight stop when crossing between Épernay and Strasbourg — it sits directly on the through-train line, about 2 hours from Épernay by direct TER (source: compass_artifact_wf-ba682d0f...). On the rail loop it's the recommended break on the long eastbound Day-4 leg. See Épernay to Marlenheim: Car-Free Travel (Source Summary).
Its centrepiece is Place Stanislas, built 1752–1756 for Stanisław Leszczyński and — with Place de la Carrière and Place d'Alliance — a UNESCO World Heritage ensemble since 1983, framed by Jean Lamour's gilded wrought-iron gates and Barthélémy Guibal's fountains. Nancy is also a capital of Art Nouveau (the Musée de l'École de Nancy), with a charming old town, the Ducal Palace / Musée Lorrain, and Lorraine gastronomy — quiche, mirabelle, macarons and bergamotes (source).
- 01Place StanislasUNESCO royal square; Jean Lamour's gilded gates.
- 02Place de la Carrière & Place d'AllianceThe two squares completing the ensemble.
- 03Musée de l'École de NancyThe capital of Art Nouveau.
- 04Palais Ducal / Musée LorrainThe dukes of Lorraine's palace and museum.
Overnight break

Direct TER ~2h

Strasbourg
Nancy isn't a wine stop — it's the one city worth a night when crossing from Champagne to Alsace, with a world-class square and Art Nouveau to fill an evening and a morning.
Break the journey here; sleep by the square.
Nancy is the standout overnight stop when travelling between Epernay and Strasbourg — it sits directly on the through-train line, ~2h from Épernay by direct TER (source: compass_artifact_wf-ba682d0f...).
Highlights
- Place Stanislas — built 1752–1756 for Stanisław Leszczyński, inaugurated November 1755; with Place de la Carrière and Place d'Alliance it forms a UNESCO World Heritage ensemble (since 1983), with gilded wrought-iron gates by Jean Lamour and fountains by Barthélémy Guibal (source).
- Capital of Art Nouveau — the Musée de l'École de Nancy (source).
- Charming old town, the Ducal Palace / Musée Lorrain, and Lorraine gastronomy (quiche, mirabelle, macarons, bergamotes) (source).
It is an excellent rail interchange and the best place to spend a night on the route (source: compass_artifact_wf-ba682d0f...).