[4] The plan assumed the construction of five trolleybus lines, including one to Ustka, 18 km away from Słupsk.

[7] Bad economic situation does not allowed the opening of lines D and E.[8] In the early 1990s, eleven functional trolleybuses were scrapped.

This caused rolling stock problems and forced trolleybuses to be supported by buses.

[4] In July 1997, MZK Słupsk exchanged seven operational trolleybuses for seven buses from Tychy.

[8] Lines as of 1987:[4] Media related to Trolleybuses in Słupsk at Wikimedia Commons