The Stadt-Express (SE), formerly City-Bahn (CB), is a train category in Germany, that links conurbations with the outer reaches of the surrounding countryside.
Deutsche Bahn no longer offers Stadt-Express services, but the Rhein-Main-Verkehrsverbund tariff association still ordered them until December 2016.
[2] The Stadt-Express has the role of linking cities to those areas outside their immediate surroundings; it therefore stops at every station in the outlying region.
Not all Stadt-Express routes followed this concept exactly; several services stopped at all stations even in the core area.
Due to the general refurbishment of the Riedbahn, which connects Mannheim and Frankfurt with a high-speed rail line, from 15 July to 14 December 2024, the Regional Express services RE4 and RE14 were temporarily converted to SE14.