In 1926, after having been editor of the SPD newspaper "Vorwärts" ("Forwards"), he started working for the Berlin Transport Department. Reuter oversaw the creation of the "Berliner Verkehrs-Aktien-Gesellschaft" (BVG) in 1928. The BVG was a merger of all of the underground, tram, and bus companies in the city. At the time the BVG was the largest public transport company in the world. It still operates today, as part of the Berlin-Brandenburg Transport Group.