Plan journeys across Germany and Europe using the Deutsche Bahn API (v6.db.transport.rest). Covers ICE, IC, regional trains, S-Bahn, U-Bahn, trams, buses, ferries. Use when: (1) planning trips in Germany or cross-border European rail, (2) checking departure/arrival boards at German/European stations, (3) finding station IDs, (4) navigating cities like Berlin, Munich, Hamburg. Triggers on questions about German trains, DB, BVG, getting around Berlin, European rail connections.

使用德国铁路API（v6.db.transport.rest）规划德国及欧洲的行程，涵盖ICE、IC、区域列车、S-Bahn、U-Bahn、有轨电车、公交车和轮渡。适用场景：（1）规划德国或跨境欧洲铁路行程，（2）查询德国及欧洲车站的发到站信息，（3）查找车站编号，（4）在柏林、慕尼黑、汉堡等城市导航。当用户询问德国列车、DB、BVG、柏林交通或欧洲铁路连接时触发。