The Rhein-Emscher-Express (RE 3) is a Regional-Express service in the German state of North Rhine-Westphalia (NRW), running from Düsseldorf via Duisburg, Gelsenkirchen and Dortmund to Hamm.

As of 15 December 2019, in connection with a change to the Rhein-Ruhr S-Bahn, a new Regionalbahn service line RB 32, the Rhein-Emscher-Bahn, was added to the timetable, which runs parallel to the RE 3 between Dortmund and Duisburg, serving the stops between Gelsenkirchen and Oberhausen that were formally served by a branch of S-Bahn line S 2, including Essen Zollverein Nord.

RB 32, the Rhein-Emscher-Bahn, runs parallel to the RE 3 between Dortmund and Duisburg each hour, also stopping at Essen Zollverein Nord, Essen-Bergeborbeck and Essen-Dellwig.

The passenger rail transport was operated by DB Regio NRW until 12 December 2009, using class 425 electric multiple units in coupled sets since the introduction of the winter timetable of 2008.

Operations are carried out using 4 four-carriage and 14 five-carriage Stadler FLIRT electrical multiple units with a top speed of 160 km/h, rented from Angel Trains.