この汽車は１５分後に東京駅に到着します。 を英語に訳すと？

This train is due at Tokyou Station in fifteen minutes.

この "due" は、due to arrive の意味でよく使われています。

◎　This train will be arriving at Tokyo Station in 15 minutes.
✖　This train will have arrived at Tokyo Station in 15 minutes. (未来完了形はダメ)

以下の三通りの表現はいずれも同じ意味:
He is arriving at the airport on Saturday at 6 in the morning. (話し言葉)
He will arrive at the airport on Saturday at 6 in the morning.
He will be arriving at the airport on Saturday at 6 in the morning. (書き言葉)
https://www.italki.com/post/question-309525?hl=en