city railway major railway german capital berlin runs berlin east west connects eastern district west intermediate stations including berlin defined slightly longer route technically correct line originally built 1880s kilometers length entirely elevated city streets track route carries trains operation structure tracks line elevated rail line totalling kilometers length including masonry arches kilometers line situated bridges cross adjoining streets times river remaining length line embankment line carries tracks pairs northern pair reserved use rail carrying tracks platforms stations southern pair tracks trains electrified german standard supplied overhead line stations platforms tracks trains stop stations depending class route train stations east west stations routes tracks currently carry routes longer distance tracks carry routes berlin airport trains use north south tunnel route trains remain long distance tracks trains mainly heading cologne usually history planning main line railways existed berlin terminal stations city edge outside city limits impractical passengers forced use carriages transfer train railway line planned connect filed planning application railway line city connecting today continuing december state prussia private rail enterprises berlin berlin bought shares jointly founded berlin city railway company things expected went bankruptcy forced prussian state government operations pay construction line state money private owners state interest line attributed military franco prussian war opinion railway networks hinder properly july der railways management commissioned manage site reported later subsidiary planned railway tracks freight passenger traffic having taken similar projects london new_york_city consideration passenger traffic received priority freight trains furthermore new railway line serve connection mainline berlin offer connections berlin suburban rail lines traffic routing influenced location existing stations line supposed connect land availability city centre original drafts called building line scrapped overly high land prices moat 17th century berlin fortress filled stations public land building railway line explains sections especially stations elevated nature sets apart previous built built street level travel construction work line started opened february local traffic opened year long distance trains costs construction including purchase land estimated million kilometre line later core route originally equipped longitudinal iron system replaced wooden early 20th century original stations seen west east today period named 1980s early 90s today connected east west stations later added august january initial operation suburban trains suburban trains operated local tracks called city track services suburbs connections berlin running half ring trains northern southern trains pulled locomotives ran smell doors train compartments opened passengers stations called train trains ran clock morning clock night typically intervals minutes depending time day early 20th century 3rd class 2nd class freight traffic freight traffic central market carried seven special trains day ran night day evening apart carried freight normal freight traffic instead freight stations wedding ring line long distance trains years trains previously terminating old operated reduce load terminus stations end 19th century train runs terminate old destination stations increasing local traffic remaining traffic consisted express trains cologne trains trains danzig trains suburban trains ran long distance tracks trains heading west usually left station heading east depots situated called station expansions station rebuilt long distance section station expanded tracks current station hall built thoroughly order handle increasing train weight train sheds replaced suburban line platforms raised height centimetres second long distance platform new hall built zoo station station hall 1950s notable dates time electric operation june suburban line fully equipped rail gear trains new class type appropriately named went service sharing track steam trains november lines leading lines berlin fully electrified suburban services moved long distance tracks local tracks steam trains disappeared ring fully operated electric trains half ring trains operated peak time services december term symbol white green circle introduced city ring suburban services post war situation world war lay devastated bombs rebuilt quickly wanted travel train converted russian broad gauge national importance diminished loss eastern germany trains ran western zones trains soviet zone terminated long distance traffic came complete halt useful established connections places line berlin terminal stations long distance stations closed station remained long distance station western city domestic train east german railways ran berlin wall built east berlin facto central station station terminal point separated west lines departure point inter zone train services west_germany station separated eastern western parts steel walls enabled change trains running line berlin passing border controls station featured border crossing trains zoo existed international traffic example paris warsaw trains later coaches shuttle trains connecting night trains scandinavia crossed german border legislation parts belonged government largest landowners regular erupted government senate allied occupation powers prices kept slightly flat fee mark charged politics populace fully run east german railways introduced bus lines running parallel network restoration cold war despite problems improvements line reconstructed great expense railway station built swamp land number lines running reduced consequence strike carried based employees september january treaty senate came force turned responsibility operation transport authority soon talks commenced improvements station carefully restored original 1880s look listed building partially rebuilt renamed time anniversary berlin founding fall berlin wall german sudden spike importance train ran cologne trains cologne hamburg hamburg line soon extended dresden prague trains munich converted trains ran western electrified july station eastern line electrified soon electrification reached zoo station ice trains began use station october large scale programme started checked strengthened tracks concrete improve comfort stations saw large financial investments thoroughly long distance traffic zoo stations interrupted construction period trains temporarily long distance line march reopened carrying ice lines lines realigned construction new berlin construction commencing completed july realigned section consisted long bridges spanning station adjacent port summer main long distance trains usually stopped renamed new opened importance line diminished slightly trains use new north south line connected remaining trains mainly heading cologne usually
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