original_query: What is the Engers-Au railway line and where is it located?
query: What is the Engers-Au railway line and where is it located?
answer: The Engers-Au railway line is a single-track, non-electrified railway line composed of three sections: the Brexbach Valley Railway, the Holzbach Valley Railway, and the Upper Westerwald Railway. It is mainly located in Rhineland-Palatinate, Germany, with a section near Au located in North Rhine-Westphalia.