S-Bahn is short for Stadtschnellbahn, the suburban rail networks that serve major German and Austrian cities including Berlin, Hamburg, Munich and Vienna. The Berlin network is the oldest, dating to 1924, and its trains and station sounds are instantly recognisable across the German-speaking world. Online, short recordings like this circulate as stock-style effects for travel videos, city edits and memes about commuting, delays and daily routine. Its appeal is its specificity, a generic train sound could be anywhere, but an S-Bahn clip places the scene immediately in a German city.