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to transfer (trains); to change (bus, train)
to change (to another ideology, party, company, etc.); to switch (to a different system, method, etc.); to move on to (e.g. a new love interest)
次の駅で急行に乗り替える。
I'll transfer to the express at the next station.
バスから電車に乗り替えた。
I transferred from a bus to a train.
乗り替えるのに十分ほどかかる。
It takes about ten minutes to transfer.