Other European railway firms, however, have until now been invoking reasons beyond their control like adverse weather to avoid paying compensation.
Germany's Deutsche Bahn, which has annual revenues of about 40 billion euros ($54 billion), said it welcomed the decision because it established legal certainty. The company claimed it had only rarely invoked force majeure to avoid compensation payments.
The railway operator in the EU's second-largest economy, France's SNCF, did not immediately return requests for comment. SNCF, with revenues of about 34 billion euros ($45.9 billion), says it ferries about 4 million passengers per day through France.
In the U.S., there's no federal rule dictating how much of a refund railroad passengers should receive for delays and cancellations. Amtrak says it offers refunds when trains are canceled or if they are delayed more than two hours.
Consumer advocacy groups cheered the ruling.
"For passengers, it's the delay that counts, not the carrier's attempt seeking to avoid his legal duty to pay compensation," said Gerd Aschoff, spokesman for the German railway passenger association Pro Bahn.
The court also clarified that railway firms aren't liable for passengers' losses due to train delays, only partial reimbursements of their ticket.
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Sarah DiLorenzo in Paris and Josh Funk in New York contributed reporting.
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Follow Juergen Baetz on Twitter at http://www.twitter.com/jbaetz