If you visited Japan as a tourist, I believe you learned enough to say hello, ask someone where your hotel is, and so on. I don’t for a second believe you learned enough to understand arbitrary train network change announcements. Unless you spend years studying the language before visiting any country as a tourist, which would be absurd.

No, I didn't learn vast amounts of Japanese, but I did learn phrases and the kanji for various destinations. It sped things up. I did not stand around and speak English to people slowly and expect them all to understand.