in Denmark. The electric voltage is different as Sweden and Germany use 15 kV AC while Denmark uses 25 kV AC. The train protection systems are also different between all three countries. This means that locomotives must be specially modified to cross the borders, while railway wagons can freely cross the border if there is a suitable locomotive. Connections to Sweden use the Øresund Railway across Øresund Bridge. Services include SJ's X 2000 service to Stockholm and Øresundståg commuter services to Malmö Central Station and beyond. There are two connections to Germany. The main connection is over land at Padborg, which carries ICE, intercity and regional trains to Hamburg, and used to carry EuroNight and CityNightLine trains to Amsterdam via Cologne, Basel via Frankfurt, Munich via Nürnberg, and Prague via Berlin. The second crossing is overland at Tønder, Denmark and Süderlügum, Germany, which connects to Niebüll. The Vogelfluglinie route, is from December 2019 closed for trains, until then carried EuroCity and ICE services, using the train ferry from Rødby, Denmark to Puttgarden on the island of Fehmarn, Germany, and from there proceeded via Lübeck and Hamburg to Berlin. The Rødby ferry and Tønder crossing allow only diesel powered trains, while the Padborg crossing is electrified. The Fehmarn Belt Fixed Link is a planned connection across the Fehmarnbelt between Denmark and Germany. Since November 2014, CityNightLine does not service Denmark anymore, and as of 2022 the only sleeper trains serving Denmark are Snälltåget's seasonal services to Berlin and the Austrian Alps. Image gallery See also History of rail transport in Denmark High-speed rail in Denmark List of railway lines in Denmark Narrow gauge railways in Denmark Transportation in Denmark Rail transport by country Notes External links Banedanmark DSB Danish Railway Signaling Arriva Tog Railion Danmark Rejseplanen - official search engine for all public transport by rail and bus in Denmark illustrated description of Denmark's railways in the 1930s