This is the 742nd most frequent Swedish word.
stoppades
"Stoppades" means "was stopped" or "was halted" in English.
In this sentence, 'stoppades' is used in the passive past tense, indicating an action that was performed on the subject (the train) by another entity.
Tåget stoppades på grund av en teknisk störning.
The train was stopped due to a technical issue.
Here, 'stoppades' reflects that the action of stopping was carried out by an agent (the police) affecting the event (the demonstration).
Demonstrationen stoppades av polisen.
The demonstration was stopped by the police.
The word 'stoppades' in this context is implying a reactionary stopping of a process (production) due to an external condition (discovery of danger).