Marchegger Ostbahn

The Marchegger Ostbahn (lit. 'Marchegg Eastern railway line') is a railway line in Austria and Slovakia. It runs 41.6 km from the Donaustadt district of Vienna to Marchegg, where it crosses the Morava river and enters Slovakia. At Devínska Nová Ves, it continues as the Bratislava–Marchegg railway line.

Route
The line splits from the Laaer Ostbahn near Wien Stadlau railway station, in the Donaustadt district of Vienna. It runs east from there to Marchegg. From Marchegg, the line crosses the Morava river and enters Slovakia. At Devínska Nová Ves, it continues as the Bratislava–Marchegg railway line.

Beginning in 2016, ÖBB has undertaken to double-track and electrify the line. Double-track and electrification opened between Wien Erzherzog-Karl-Straße and Wien Aspern Nord with the December 2018 timetable change. Electrification was extended to Marchegg in December 2022; work on double-tracking continues. Works to electrify the section from Marchegg to Devínska Nová Ves are going to start in March 2024 with the opening scheduled for December 2024. The project to double-track the section is under environmental review.

Operation
The of the Vienna S-Bahn operates half-hourly between Wien Hütteldorf and Wien Aspern Nord. Some Regionalzug services operate between Wien Hauptbahnhof and Marchegg, while Regional-Express trains operate through between Wien Hauptbahnhof and Bratislava main.