Translate the following English sentence to French:
"Because they did not know about radioactivity, and were not informed about it, some members of staff at the Woippy marshalling yard, in the Lorraine region, used to gather round these heat-generating carriages to keep warm in winter."
Faute de connaissances et d'informations sur la radioactivité, certains personnels de la gare de triage de Woippy, en Lorraine, se rapprochaient en hiver de ces wagons qui chauffaient et les réchauffaient.