One of the most fascinating facets to traveling throughout the United States, particularly in metropolitan areas, is learning the subway and light rail nomenclature. Scores and scores of US cities use pronouncable acronyms for their transportation systems and many use the terminology in their daily existence without knowing it actually stands for something.
First, there are the myriad of combinations that can be used when Area Rapid Transit are the last three letters. ART is a word, and ART is a great many words when an additional consonant is placed before them. There’s MARTA in Atlanta, the DART in Dallas, the SEPTA in Philadelphia, the BART in San Francisco, plus the MUNI.
I wonder, does Frankfurt have a subway system?