The Waldenburgerbahn have published a (German) pdf at https://www.blt.ch/fileadmin/user_upload/PDF_Content/WB/Linie_19_Ausgabe_1_2018.pdf

detailing the forthcoming gauge change works and other alterations.

The two main points are no trains between Waldenburg and Bubendorf 07.07.2018 to 30.07.2018 inclusive (bus replacement)

A building will be built to display G 3/3 5 and (if the artist impression is accurate) a coach and a van at Thalhaus.

The steam train will run one last time for photographers on 23.09.2018. This train will NOT carry passengers