[1] It was established as a replacement for older no longer adequate tram system and went into operation on 27 April 1952, when Mariánské Lázně was in Czechoslovakia.

Lines 6 and 7 require hybrid (currently diesel/electric) trolleybuses to service small parts of the network not-equipped with overhead wires.

Since the second half of 1990s the town's council tried to get rid of the trolleybus network claiming high maintenance costs.

Other quicker variant of stopping the service sooner was not possible as there was an EU restriction in place on a new bus terminal near the main railway station which is also used by trolleybuses.

Since EU fond helped financing the terminal they expected it to stay intact and work the way it was designed to at least till 2017.

In 2023, major investments were made to upgrade the outgoing substation as well as wired section in larger areas,[15] including the city center loop or the area near the depot up to the Antoníčkův pramen loop where a new overhead track was added allowing easier manipulation and multiple trolleybus charging at the same time.In recent years and especially in 2023[15] investments were made to greatly improve the situation of a previously worn out wired network.

But even the long lasting and very old components, including the ancient high angle Power-on/Power-off type switches (which were no longer in use anywhere in the Czech Republic for decades) were finally removed from the streets.

Fortunately in this instance, it was finally upgraded in 2023 with all new components.The below table lists all trolleybuses currently in operation in Mariánské Lázně.