Cos’è questo sotto il sedile in una U-Bahn in NRW?

**Have you read our extensive wiki yet? It answers many basic questions, and it contains in-depth articles on many frequently discussed topics.
[Check our wiki now!](https://www.reddit.com/r/germany/wiki/index)**

*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/germany) if you have any questions or concerns.*