The Berlin Stadtbahn is the historic east-west elevated railway of Berlin. It runs from Friedrichshain in the east to Charlottenburg in the west, connecting several of the most major sights of the German capital. The line is protected cultural heritage since 1995. It is often defined more simply as the slightly longer route between Ostkreuz and Westkreuz, although this is not technically correct.

An elevated railway or elevated train is a railway with the tracks above street level on a viaduct or other elevated structure. The railway may be broad-gauge, standard-gauge or narrow-gauge railway, light rail, monorail, or a suspension railway. Elevated railways are normally found in urban areas where there would otherwise be multiple level crossings. Usually, the tracks of elevated railways that run on steel viaducts can be seen from street level.