After an option running to the south-east was eliminated, the plan for a railway from Mainz via Bad Münster along the Glan, sharing the Kusel line between Altenglan and Glan-Münchweiler was adopted. The latter would be duplicated on this section at a total cost of 1.108 million marks. Construction began in July, 1902, with the work divided into several sections, including the Altenglan–Lauterecken section. This work was carried out by Italian day labourers. The Glan Valley Railway from Bad Münster to Homburg was opened throughout on 1 May 1904; from Glan-Münchweiler to Altenglan it ran together with the Kusel–Landstuhl railway. Altenglan was rebuilt as a “wedge station” (Keilbahnhof) and it also received a new entrance building. There was a total of 26 stations along the new line through Altenglan. The line between Altenglan and Rammelsbach was changed since the Rammelsbach tunnel had proved to be too narrow for freight trains. This meant that it was often necessary to tranship freight to Kusel from wagon to wagon. The new line opened in 1936 ran around the Remigiusberg (hill) instead. In the same year an extension was completed from Kusel to Türkismühle for strategic reasons, yet for the time being no through trains ran between Altenglan and Türkismühle. Due to the dissolution of the "Reichsbahndirektion" (railway administration of) Ludwigshafen and the division of the Glan Valley Railway between the "Reichsbahndirektion" Mainz (immediately north of the station) and the "Reichsbahndirektion" Saarbrücken (from Homburg to Altenglan), the track supervisor’s office ("Bahnmeisterei") of Altenglan, which had existed since 1904, was closed in 1937. Between 24 and 27 September 1938, a military exercise was held in the Palatinate. Troop trains from Frankfurt were despatched to stations including, among others, Altenglan. Since during the Second World War, the timetable could often not be met, a directory of “essential trains" was published on 5 May 1941.