Where was The Battle of the Rails filmed?

1946 film by René Clément

The Battle of the Rails (1946) was filmed in Saint-Brieuc, Lannion, Guingamp, Plouaret, Trégrom, Dissay-sous-Courcillon and 2 more places, 8 places named in its Wikipedia article, in France. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data