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sakuya, densya ga okurete yakusoku ni tikoku site simaimasita.

昨夜さくや、　電車でんしゃ　が　遅おくれて　約束やくそく　に　遅刻ちこく　して　しまいました。sakuya, densya ga okurete yakusoku ni tikoku site simaimasita.
Last night, the train was late and I ended up being late for the appointment.
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Questions & Answers about sakuya, densya ga okurete yakusoku ni tikoku site simaimasita.

What’s the difference between 遅れる and 遅刻する?
  • 遅れる literally means “to be late” or “to run late” for something or “to be delayed” (e.g. a train, a meeting). It focuses on the fact that something/someone doesn’t arrive or start on time.
  • 遅刻する specifically means “to arrive late” for a scheduled event or appointment. It always implies you missed the start or deadline of something you were supposed to attend.

In our sentence, 電車が遅れ (“the train was delayed”) causes “I” (the speaker) to 遅刻してしまいました (“end up arriving late” for the appointment).

Why is 電車 marked with が, but 約束 with に?
  • が marks the subject of 遅れる (the thing doing the delaying). Here, the train itself is experiencing the delay: 電車が遅れて.
  • に marks the target or point you’re late for when using 遅刻する. You’re late for the appointment, so you say 約束に遅刻して.
What does the ～てしまいました form express here?

The construction ～てしまう (in past polite form ～てしまいました) adds a nuance of regret or unintended outcome. It shows:
1) You feel sorry about the result.
2) The action was completed (you definitely were late).

Without しまいました, the sentence would be more neutral; with it, you express “I regret I ended up late.”

Why does the sentence use both 遅れて and 遅刻して? Aren’t they redundant?

They serve different roles:

  • 遅れて (て-form of 遅れる) explains the cause or situation: the train was delayed.
  • 遅刻して (て-form of 遅刻する) plus しまいました describes the speaker’s result or regret: you arrived late for your appointment.

Using the て-form connects cause and effect smoothly.

Why is there no explicit subject before 遅刻してしまいました?
Japanese often omits the subject when it’s clear from context. Here, the speaker is obviously the one who was late, so you don’t need to say 私が.
Could I say 電車が遅れたので約束に遅刻してしまいました instead of 電車が遅れて～?

Yes, you can use ので to show cause:
“電車が遅れたので、約束に遅刻してしまいました。”
That’s perfectly correct. The ～て form is just a more casual/flowing way to link actions: “the train was delayed, so I ended up late.”

Can I replace しまいました with ちゃいました?

Yes. In casual speech, ～てしまう often contracts to ～ちゃう (and the past ～てしまった to ～ちゃった). So you’d say:
“昨夜、電車が遅れて約束に遅刻しちゃいました。”
It’s more informal and friendly.