乗った列車は

the train someone rode

→ 乗る
phrase Rare #45,748
the train someone rode The person who rode the train is usually named before の, as in 彼の乗った列車 (the train he rode). は marks the train as the topic.
JA: 彼の乗った列車はもう出発した。
EN: The train he was on has already left.

彼の乗った列車は東京駅に着いた。

The train he was on arrived at Tokyo Station.

私達の乗った列車は長いトンネルを通過した。

The train we were on passed through a long tunnel.

私達の乗った列車は大雪のために遅れた。

The train we were on was delayed because of heavy snow.