駅に着いた時

when (someone) arrived at the station

→ 駅
phrase Rare #27,461
when (someone) arrived at the station The subject is understood from context; 着いた means “arrived,” and 時 means “when.”
JA: 駅に着いた時、友達に電話しました。
EN: When I arrived at the station, I called my friend.

駅に着いた時、乗るつもりの電車が出てしまったことに気付いた。

When I arrived at the station, I realized that the train I intended to take had already left.

私が駅に着いた時、急行がちょうど到着するところだった。

When I arrived at the station, the express train was just arriving.

私達が駅に着いた時に列車はもう出てしまった後だった。

The train had already left by the time we arrived at the station.