。
The train was stopped due to the storm.
Literal
Storm [reason-のため] train [topic-は] stopped.
嵐のため列車は止まった — のため marks the cause. 止まった is the intransitive 'stopped (on its own / came to a halt),' contrasting with the transitive passive 止められた ('was stopped by someone'). Japanese often prefers the intransitive form for events with no clear human agent — the storm shut things down, not a person.