A few days later, on 24 October 1940, the extension to Makartplatz followed, and on 10 November 1940, the line was further extended, to Salzburg Hauptbahnhof.

In the following years, the Salzburg trolleybus system recorded rapid growth, but the tramway network was destroyed.

Some diesel bus lines also originally belonged to the company, but in the course of the 2000 merger these were transferred to Albus Salzburg.

Also, until September 2006 the Gaswerkgasse / Ignaz-Harrer-Strasse intersection, and the Hauptbahnhof area around the Forum-Kaufhaus/Fanny-von-Lehnert-Straße, were provided with additional turning and reversing capabilities.

In autumn 2008, the Salzburg Municipal Council decided to electrify the branch of bus line 20 to Sam / Lankessiedlung.

It is proposed to run line 10 through the Strubergasse in future, and thereby provide a better connection with the Struber barracks.

Additionally, by means of a branch in the Karolingerstrasse, line 8 will serve the many businesses and residents in that district.

[needs update] For quite some time, an extension to Eugendorf, or a cross-border line to Freilassing in Germany, have also been discussed.

[needs update] For many years until about 2000, almost all of the trolleybuses operating on the Salzburg system were made either by the German company MAN or its Austrian counterpart Gräf & Stift.

On 24 November 2008, two more Van Hool articulated vehicles arrived in Salzburg as secondhand acquisitions from the Montreux–Vevey trolleybus system, in Switzerland.

[8] Following renovation work, including repainting into the dark-red-and-white livery used on the trains of the Salzburger Lokalbahn, they were placed in service in March 2009.

The Solaris vehicles were painted dark red and have an auxiliary drive, to allow movement away from the overhead wires.

(Four more trolleybuses of the same type were acquired secondhand from Solaris in 2013, after the La Chaux-de-Fonds system closed and returned the vehicles to the manufacturer;[10] the last of these were retired in 2024.)

In 2012, Salzburger Lokalbahn (SLB) became the operator of the trolleybus system,[10] and its livery of red-and-white (previously applied only to the two ex-Montreux–Vevey vehicles) was given to the Solaris Trollino vehicles, along with branding "Obus SLB" on the front ends—Obus being the German word for trolleybus.

321, was delivered in May 2012,[10] and the total number of Solaris Trollino MetroStyle trolleybuses ultimately reached 51, with the last arriving in 2018.

402) was delivered in August 2019 and entered service in September,[14] and the last had been received by February 2020, by which time seven more had been ordered.

[12] Additional orders placed subsequently increased the total number of Hess trolleybuses in the fleet to 42 by 2023, the last deliveries being of nos.

From late July to late August each year, to coincide with the Salzburg Festival, the ÜHIIIs ran on a regular basis every Friday, on a special heritage line of the Association Pro Obus Salzburg eV.

[16][17] Two other serviceable heritage vehicles, also in the care of Pro Obus Salzburg eV, are the 1985-built Gräf & Stift articulated trolleybus no.