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Originally Posted by swimmer_spe
https://en.wikipedia.org/wiki/Berlin#Transport
System Stations / Lines / Net length Annual ridership Operator / Notes
S-Bahn 166 / 16 / 331 km (206 mi) 431,000,000 (2016) DB / Mainly overground rapid transit rail system with suburban stops
U-Bahn 173 / 10 / 146 km (91 mi) 563,000,000 (2017) BVG / Mainly underground rail system / 24h-service on weekends
Tram 404 / 22 / 194 km (121 mi) 197,000,000 (2017) BVG / Operates predominantly in eastern boroughs
Bus 3227 / 198 / 1,675 km (1,041 mi) 440,000,000 (2017) BVG / Extensive services in all boroughs / 62 Night Lines
Ferry 6 lines BVG / Transportation as well as recreational ferries
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The Berlin S-Bahn is a strange beast. It's a third-rail powered, heavy metro system that runs mostly in trenches and elevated. Further out, where rail corridors were already established, it runs on the surface, but always on dedicated tracks. The north-south stretch through the city centre is about half tunnelled. Most of the areas it serves--even when suburban--would be the envy of any Canadian city.
Semi-relevant trivia: DB is currently building a second northern tunnel, which will provide north-south S-bahn service to Hauptbahnhof, and will also relieve a capacity problem for north-south lines. Currently, the north-south S-bahn tunnel has 4 platform stations from Potsdamer Platz south. To the north, stations are only 2 platform and basically indistinguishable from any U-bahn station, until Nordbahnhof, which used to be a busy terminus station. Its location at the wall all but killed its function as such, which limited the entire northern S-bahn capacity and, subsequently, that of the N-S lines in general. The new N-S tunnel should allow DB to double frequencies on the S1 and S2 lines.
Anyway, there's been a lot of talk about GO becoming more S-bahn like. This talk isn't wrong, but it has little to do with Berlin's S-bahn.
Most S-bahns are catenary powered. In big cities like Munich and Cologne they provide something like a centralized suburban collector, with high-frequency service connecting outlying areas with the central station. This kind of service is something like RER or a more heavy-duty Skytrain.
In smaller cities, S-bahns work more like light-duty regional trains. Leipzig, for example, has a massive S-bahn network serving a series of villages and a far-flung smaller city. Service isn't terribly frequent but the system is well-coordinated so that riders can make efficient transfers.
However it functions, the S-bahn is always on dedicated tracks.
Regional Bahns are a different story. These pull a lot of weight as commuter rail, but their main function is as regional connectors--think of regional in this sense as "provincial": the Regional Bahn in Brandenburg is to get around Brandenburg.
DB's Regional Bahns are big, double-decker, catenary-powered trains, a lot like GO trains. Hourly, all-day, bidirectional service is typical.
But there are also private or province-run regional-rail providers who tend to run smaller DMUs, sometimes on dinky single-track lines. This is the level of service I expect to be available somewhere like the Lower Mainland, or around any of Canada's mid-sized cities. As ridership grows, it's possible to upgrade this to the kind of service (S-bahn, basically) Canadians think of when they hear "regional rail".
Al mentioned BER airport. This is not only an airport, but a major regional rail hub for Brandenburg, Saxony, and even MecPom. To ease the pain of high gas prices, the German government introduced a 9 Euro monthly rail pass that covers all local and regional transit--in the entire country. Using the BER hub, it's possible to take an express train from north Berlin to the airport and transfer to a Regional Bahn to Dresden--all included in that pass. It's not as fast as an intercity train but it illustrates the layered levels of service available in this country.